Shared Intention

The Philosophical Problem of Intending Together

Two people can happen to walk in the same direction, and two people can walk together. The observable movements may be indistinguishable for a time. Each might believe the other is heading for the same destination. Yet an encounter between strangers remains different from an agreed walk in which each adjusts pace, waits when the other stops, and regards the continuation as their common undertaking. The philosophical problem of shared intention is to account for this practical difference.

The central question is what makes an intention jointly held. Does each person have an ordinary intention whose content concerns the group? Must the parties undertake a distinct joint commitment? Can the intention belong to a plurality without there being a single collective mind? Does its collective character reside in what is intended, in the manner of intending, in reciprocal relations between intentions, or in the practical obligations generated by association? Each answer changes what can be inferred about coordination, authority, and responsibility.

The phenomenon has several degrees of organization. Two strangers may briefly help lift a fallen object. Friends may arrange a trip over several months. Musicians may perform from a common score while responding continuously to one another's timing. A committee may reach a decision through a formally recognized procedure, even though some members disagree with the outcome. These cases reveal a family of shared practical structures. They also warn against making the most complex example the definition of every case (Bratman, 1992, 2014; Gilbert, 1989, 2006; Tuomela, 2013).

The monograph develops a criterion of philosophical adequacy: an account must identify what the parties are jointly doing, explain why each participant's intention concerns the others in a practically effective way, clarify the knowledge or recognition needed for that dependence, and state which normative expectations follow. These questions can be addressed without presupposing a collective consciousness. They demand serious attention to the social structure of intending, not simply to the grammatical appearance of the pronoun we.

Definition and Conceptual Boundaries

Shared intention designates an organized practical relation in which multiple agents are committed, in an appropriately interconnected manner, to carrying out an activity as a joint undertaking. This working definition identifies the subject without settling the central controversy over its metaphysical realization. Some theories analyze the organization as a constellation of individual intentions; others give constitutive significance to joint commitments or to an irreducible collective mode of intending.

Intention ordinarily has a future-directed planning role: a settled intention frames subsequent deliberation, constrains compatible options, makes means relevant, and persists through temporary interruptions. It also has an action-guiding role during performance. Shared intention places these familiar functions in an interpersonal setting. My preparations may depend on your preparations; the question of what I should do next may depend on how you understand the task; our undertaking may be abandoned or renegotiated through processes that neither of us unilaterally controls (Bratman, 1987, 2014).

A shared goal is the state of affairs participants seek to bring about. A shared intention is a practical attitude or organization directing them toward that goal. A common preference for a finished bridge can exist among people who have made no arrangement to build it. Conversely, a team may undertake to build a bridge despite differing ultimate preferences about funding, recognition, or the final use of the structure. A common objective alone therefore supplies too little of the structure that joint intention normally explains.

Shared intention also differs from collective intentionality considered broadly. The latter includes collective belief, acceptance, attention, and emotion, as well as intention. Joint action is the activity carried out under relevant conditions; shared intention may precede action, survive a temporary failure of execution, or be abandoned before action begins. Collective agency concerns the wider question of how pluralities act as agents. Group agency concerns whether a group itself can bear attitudes and decisions. These distinctions preserve the narrow object of the present dossier while clarifying its explanatory connections (Schweikard & Schmid, 2020; Roth, 2017).

The word shared can misleadingly suggest that a single mental object moves between persons. Philosophical accounts usually seek an account of relation, constitution, or mode: what it is for intentions to be appropriately interrelated, for persons to undertake commitments together, or for intentional attitudes to be held as members of a collectivity. Establishing this structure is a conceptual task; showing how people learn or implement it is a complementary empirical task.

Joint Performance and the Problem of Mere Parallelism

The first diagnostic case involves coordinated behavior without joint undertaking. Suppose two workers independently decide to repair opposite ends of a fence. Each knows the other is there, and both welcome the completed repair. Their activity may be compatible and mutually beneficial. If neither takes the other's work as constitutive of a common undertaking, one can plausibly describe two individual projects rather than a shared intention.

Add an explicit understanding: each says that they will repair the fence together, allocates tasks, expects the other to continue, and is prepared to adjust in response to unforeseen difficulty. A change in one person's plan now has significance for the other precisely because their plans are linked. If one leaves unexpectedly, the remaining worker may reasonably ask what happened. The difference concerns the practical organization of conduct and, potentially, the standing to make demands.

Parallelism is thus compatible with common aims, causal interaction, mutual prediction, and even a high degree of behavioral synchronization. Shared intention must explain something beyond those features. But the demand for more should remain proportionate. People can carry a table together without previously negotiating a detailed plan. Their coordination may emerge through gestures, bodily feedback, and quick adjustment. A theory that requires elaborate verbal agreement would exclude familiar examples of successful shared action (Tollefsen, 2005).

These examples produce an important methodological distinction. Necessary conditions for an explicitly negotiated shared plan may exceed the necessary conditions for modest, improvised shared action. The same word intention can refer to the intended joint activity at different temporal scales: a long-term plan, an immediate commitment, or continuously updated control of a common movement. The explanatory burden is to identify the right scale in each case.

Aristotle and the Classical Architecture of Practical Deliberation

Aristotle's Nicomachean Ethics gives a fundamental account of voluntary action, choice (prohairesis), and deliberation (bouleusis). Book III distinguishes what originates in the agent from actions produced through force or ignorance, and treats choice as intimately connected to deliberation about what lies within the agent's practical capacity. Book VI relates practical wisdom to deliberation about what should be done. These analyses establish a vocabulary for understanding intention as situated within reasons, means, choice, and action rather than as an isolated desire (Aristotle, Nicomachean Ethics, III.1–5, VI.5–13).

Aristotle's Politics also treats human life as characteristically associative and interprets political community as ordered toward goods that agents pursue together (Politics I.1–2, 1252a–1253a). His treatment of friendship and common living further supplies a conception of shared practical life that extends beyond occasional instrumental collaboration (Nicomachean Ethics VIII–IX). These passages are historical antecedents to questions about acting with others, but they do not contain Bratman's later technical analysis of interlocking intentions or Gilbert's doctrine of joint commitment.

An important tension already becomes visible through the classical framework. Deliberation usually concerns what an agent can bring about through agency, yet the success of a joint enterprise depends on participants who retain their own deliberative authority. One cannot simply decide for another free participant. Shared intention therefore raises a question about practical control that exceeds the conditions of ordinary individual choice.

The historical value of Aristotle lies in the distinction between wishing for an end, deliberating about means, and undertaking action. Those distinctions remain crucial when the end is collective. Several persons can wish for the same outcome while failing to settle on any common practical undertaking. Conversely, a common undertaking can organize individual choices and make cooperation intelligible as action directed by reasons. The modern question is how that practical organization is socially constituted.

Authorization, Association, and Early Modern Social Thought

Thomas Hobbes's Leviathan offers a different antecedent. Chapter XVI analyzes persons and representation, distinguishing an actor from those who authorize action on their behalf; chapter XVII describes how a multitude can be organized as a common political person through authorization. The philosophical point for the present problem is that action attributable to a plurality may depend on a recognized structure of representation rather than on each member directly performing the attributed act (Hobbes, 1651, chs. XVI–XVII).

Hobbes is investigating political unity and the grounds of sovereign authorization, a much more specific problem than two people cooking dinner together. Nevertheless, his analysis reveals how plural agency can be mediated by publicly intelligible arrangements. An institution's decision might be attributable to members through a procedure even when the members do not share the same immediate intention. This is an important limit on extending small-group accounts to corporate actors.

Later social and political thought develops the relation between agreement, association, common action, and the normative bonds of membership. Modern sociology likewise distinguishes organized social action from coincident behavior. Gilbert's reconstruction of social facts is historically situated among questions associated with Durkheim, Simmel, Weber, and the philosophy of convention (Gilbert, 1989). Their relevance lies in the problem they raise about the existence of relations that individuals sustain but that are not described adequately by counting isolated private decisions.

The contemporary terminology of shared intention, joint intention, and we-intention belongs principally to recent philosophy of action and social ontology. A disciplined history keeps the classical and early modern antecedents distinct from that later theoretical formulation. Historical continuity consists in persisting questions about common practical orientation, membership, and authority, with substantial transformations in the available conceptual apparatus.

The Intentional Turn in Contemporary Philosophy of Action

Twentieth-century philosophy of action sharpened the distinction between intentional behavior and mere physical occurrences. G. E. M. Anscombe's Intention (1957) treats intentional action as action under a description for which a distinctive kind of why-question is applicable. Donald Davidson's causal theory takes reasons that appropriately cause actions to be central to explanation (Davidson, 1963). These theories chiefly address individual agency, yet they create a setting in which the intentional organization of joint activity becomes a precise philosophical problem.

An account of shared intention can adopt the ordinary theory of intention as a starting point and then ask what additional interpersonal relations are required. This is Bratman's strategy. Alternatively, it can argue that a jointly held intention has an essentially plural character that cannot be analyzed entirely through individually familiar intentional attitudes. This is an important theme in Searle, Gilbert, and we-mode approaches, though their conclusions and metaphysical commitments differ.

Planning theory adds temporal depth to the individualistic starting point. An intention can settle a practical question provisionally, guide future reasoning, support coordination across time, and create rational constraints on conflicting intentions. These functions are particularly important for resource-limited agents who cannot deliberate afresh at every moment (Bratman, 1987). In shared action, a participant's intentions must somehow acquire this stabilizing significance for other participants.

The contemporary debate thus arises where philosophy of mind, action theory, and social ontology intersect. A theory of mind supplies the form of attitudes; action theory explains their guidance of conduct; social ontology asks how relations between agents constitute a shared undertaking. Normative theory then asks what participants owe one another by virtue of it.

Searle's Primitive We-Intention

John Searle's essay “Collective Intentions and Actions” (1990) proposes that collective intentionality has a distinctive irreducible form. Consider two people running to shelter from rain. They might individually run for shelter in parallel, or each might run as a member of an undertaking they recognize as ours. The causal motions may look similar, but the intentional content and structure of the cases differ.

Searle holds that genuine collective activity involves a we-intention, rather than a mere aggregate of I-intentions plus mutual beliefs. The we-form marks the actor's understanding of an act as a contribution to what the participants are doing together. His account remains psychologically individual in the sense that intentional states are instantiated in individual agents; it does not require a collective brain or a metaphysically separate group mind.

The major strength of this approach is its diagnostic insistence on a first-person plural practical orientation. If each participant privately wishes for the success of the same endeavor while treating the others as external instruments, the characterization we intend may misdescribe the activity. Searle forces the analyst to account for the intentional significance of participation as such.

The limitation concerns explication. If the we-intention is taken as a basic intentional mode, the theory still needs to explain how different persons' we-intentions connect, what makes them appropriately co-refer to the same undertaking, and why one participant's revision should matter normatively to another. A shared plural expression by itself cannot rule out disagreement about which activity is jointly intended or about who belongs to the acting plurality. These difficulties motivate more structured accounts (Searle, 1990; Schweikard & Schmid, 2020).

Bratman's Planning Theory: The Fundamental Proposal

Michael Bratman's writings on shared cooperative activity and shared intention propose that a small-scale joint undertaking can be explained using resources familiar from the philosophy of individual planning (Bratman, 1992, 1993, 1999, 2014). On this approach, the participants have interconnected intentions concerning the joint activity, formed under mutually understood conditions and accompanied by compatible subsidiary plans.

The characteristic form is that each participant intends that we carry out an activity. I intend that we paint the house, and you intend that we paint the house. The intended object is our joint painting, although the intentions are individually held. Their plurality does not disappear into a single super-agent. They are connected through how each understands and supports the other's participation.

There are several further conditions. The participatory intentions must be mutually consistent; relevant subsidiary plans must mesh, meaning that they can be jointly carried out; the participants must intend the joint activity in ways responsive to the others' intentions; and there must be an appropriate shared understanding of these relations. Exact formulations vary across Bratman's publications, and his 2014 book systematically develops the planning-theoretic explanation rather than merely restating a static checklist.

The distinctive theoretical ambition is constructive. Instead of starting by positing an irreducible joint willing, Bratman identifies a network of attitudes and rational relations that can realize shared planning. The explanation has a clear advantage in modest cases, where people coordinate without forming an institution, creating a group person, or accepting a robust political obligation.

The main issue is whether the proposed network can fully constitute the social character of the shared undertaking. Some critics argue that intending that we perform an activity already invokes the very plural agency the theory is supposed to explain. Others ask whether shared intention entails an interpersonal authority that individual planning norms cannot generate. The power of Bratman's proposal lies in presenting these controversies in a tractable form.

Participatory Intentions and the Joint Objective

An intention of the form “I intend that we perform J” has an unusual intentional object. Ordinarily, one intends an action one expects to perform. Here, the success condition includes another person's contribution. The philosophical question is whether one can intend the achievement of something partly dependent on someone else's voluntary agency.

Bratman's answer is connected to the difference between intending an outcome and controlling every causal condition of that outcome. A person may intend to attend an outdoor concert while relying on weather, transport, and the organizers. In the shared case, one may intend that the pair perform J while recognizing that the other agent must freely participate. Intention can be rationally directed toward an outcome whose realization requires dependable cooperation (Bratman, 2014).

This defense requires further specification. Expecting another agent to cooperate is a predictive attitude; treating that agent as a partner is a participatory practical attitude. If my plan counts on your contribution merely as it counts on the arrival of a train, I may have a plan involving you without sharing a plan with you. Accordingly, participatory intention must be coupled with responsiveness to your intentions, not merely confidence about your behavior.

The difference is evident in collaborative writing. I may intend that we jointly compose a paper because I know you will contribute and because I regard our developing decisions as jointly revisable. Alternatively, I may plan to publish a paper using passages I expect you to produce without consulting you. Identical predictions about material output do not establish an identical practical relationship. Shared intention involves the relation in which the anticipated contribution is understood as part of an undertaking among participants.

Meshing Subplans and Rational Coordination

The meshing-subplans condition is one of the clearest elements of planning theory. Suppose we have agreed to paint a room, but I plan to paint every wall white while you plan to paint every wall black. Our high-level aim may match linguistically, yet the plans cannot both be executed as specified. To intend the joint task cooperatively, we must be disposed to resolve the conflict and to develop mutually workable partial plans.

Meshing is therefore more demanding than accidental compatibility. Two independently formed plans may happen to fit. Shared planning involves an intention to preserve or restore compatibility as the undertaking develops. This rational orientation helps explain why another person's proposed change appears to me as something to consider rather than as a random external disturbance (Bratman, 1992, 2014).

Subplans are often incomplete. The group need not settle every means in advance. Intentions serve partly by making subsequent questions salient: who brings the paint, when the work begins, what happens if one person is delayed. Incomplete plans remain joint if there is a shared framework for their progressive elaboration. This feature is especially important for unfamiliar tasks, where planning must continue during performance.

The condition also has limits. A coercive coordinator can impose meshing subplans on people who pursue the activity under threat. A team can display highly organized procedures while its members resist any meaningful identification with the group project. Plan compatibility and mutual adjustment may be necessary elements in many cases, but whether they suffice for voluntary shared intention depends on the wider account of recognition, agency, and normativity.

Mutual Responsiveness and Practical Interdependence

Mutual responsiveness is the practical heart of shared activity. Participants monitor one another's relevant actions and intentions and modify their own contributions so that the undertaking can proceed. A dancer changes timing after a partner's hesitation. A pair carrying furniture adjusts grip and direction. Members of an editorial team revise assignments because another member's research changes the feasible timetable.

Responsiveness need not involve constant deliberation. Skilled interaction can be automatic, anticipatory, and physically embodied. Nevertheless, the actions are intelligible under the description of a common practical task. Each contribution has its meaning partly through its relation to the other. The question is whether this responsiveness is constitutive of the shared intention, evidence of an underlying intention, or principally a condition of successful execution.

There is a useful distinction between practical reliance and reciprocal consideration. One participant can rely on another's stable behavior without treating the other as a collaborator. Reciprocal consideration occurs when each acknowledges the other's relevant practical perspective in choosing, maintaining, or adjusting a contribution. Shared intention often requires this second relation even when the interaction is asymmetrical in expertise or labor.

A central philosophical result follows. The intention to undertake an activity together cannot be evaluated solely through the eventual success of the activity. Some joint endeavors fail despite adequate mutual responsiveness and genuinely shared commitment. Others succeed through lucky alignment without ever establishing a shared practical relation. The success of a collective outcome and the existence of a shared intention are separate explanatory facts.

Common Knowledge, Mutual Recognition, and Communication

Bratman's classical formulations make common knowledge or appropriately shared understanding central to the interlocking structure of intentions. A participant should not merely intend that they act together; each must have some access to the fact that the other is committed in a relevant way. Without such access, a pair may have matching private plans but lack a joint practical organization (Bratman, 1993; 1999).

In epistemic logic, common knowledge is demanding: everyone knows a proposition, everyone knows that everyone knows it, and so on through indefinitely iterated levels. The philosophical challenge is whether actual participants require something this strong. Everyday collaboration rarely involves explicit reflection on unbounded hierarchies of mutual beliefs. A shared announcement, mutual acceptance of a proposal, or an established social practice may create practically sufficient recognition without a conscious sequence of higher-order judgments.

A promising distinction separates the logical ideal of common knowledge from practical common ground. Common ground is a publicly usable basis for coordination: participants can orient their conduct around the same understood undertaking and correct misunderstandings when they matter. It need not require infallibility, complete transparency, or perfect agreement about every implication. This distinction explains why conversation and public signals are useful in constituting shared intentions.

Communication can be verbal, conventional, or bodily. A request followed by a mutually understood acceptance may initiate a project. A concert ensemble relies on rehearsed signals, timing, and common conventions. The philosophical work is done by uptake and reciprocal recognition; a string of words cannot constitute shared intention if the parties interpret the proposal incompatibly. Conversely, a wordless response can make participation clear.

Gilbert's Plural Subject and Joint Commitment

Margaret Gilbert develops a plural-subject approach in On Social Facts (1989), the essay “Walking Together” (1990), and later work on joint commitment (2006). Her central claim is that everyday descriptions of acting together and of membership in a group involve relations that can be elucidated through persons being jointly committed to an undertaking.

A joint commitment is formed through expressions of readiness by the parties under conditions of common knowledge or mutual understanding. Once the commitment exists, the participants are bound together in a way that creates standing: one participant may have grounds to rebuke another for acting contrary to the joint undertaking. The commitment is joint because no single party has the simple unilateral power characteristic of an individual decision to dissolve it on behalf of all (Gilbert, 1989, 2006).

The walking example makes the normative difference vivid. If two strangers happen to walk alongside one another, one may turn down a side street without explanation. If they have undertaken to walk together, an abrupt unilateral departure can properly invite a question or complaint. Gilbert interprets this entitlement as rooted in the joint commitment rather than merely in the disappointed expectations of each individual.

Gilbert's later formulation develops three challenges for accounts built exclusively out of personal intentions: the disjunction criterion, under which shared intention can diverge from each participant's private intention; the concurrence criterion, under which change or release can require the parties' participation; and the obligation criterion, under which participants acquire a distinctive standing to demand conformity to the joint undertaking (Gilbert, 2009). These criteria are a connected argument for treating joint commitment as the constitutive source of sharing: the very facts about revision and directed claims that are difficult to infer from matching private plans become intelligible once participants are jointly committed to intend as a body. The decisive question is whether each criterion identifies a necessary feature of all shared intentions or a feature characteristic of robust, explicitly established cooperative practices.

The approach is philosophically significant because it explains a form of obligation not obviously generated by matching preferences or independently held intentions. It also accounts for the persistence of group practices despite changes in some members' private desires. Yet a further question arises about its range. A brief improvised action between strangers may be shared despite a lack of evidence that the parties undertook a commitment strong enough to ground Gilbertian obligations. The theory's strength for robust social practices may become a challenge when applied to the lightest forms of coordination.

The Normative Problem: What Do Participants Owe One Another?

Shared intention has an apparent normative dimension. Partners can ask for reliability, explanation, or renegotiation. A unilateral change can be criticizable in a way that would not be criticizable if the same person were pursuing a solitary plan. Philosophers disagree about whether these claims are constitutive of shared intention and, if so, where their force originates.

A planning theorist can explain some interpersonal constraint through individually accepted bridge intentions. If I intend that our plans mesh, my own plan-rationality requires me to take your relevant intentions seriously. The obligation is mediated by my intention and its rational coherence. This mechanism explains why your plan can constrain my planning without requiring a new source of binding moral obligation (Bratman, 2014).

Gilbert locates a stronger source of directed obligations in joint commitment. On her account, the participants' shared undertaking confers a standing against each other that cannot simply be equated with the requirements of individual consistency. A social relation creates a claim. It is possible to violate that claim even while acting for reasons that make sense within one's own isolated practical standpoint (Gilbert, 2006, ch. 7).

A critical synthesis must distinguish rational demands, associative expectations, moral obligations, and legally enforceable duties. A partner's departure from an informal project may be disappointing or objectionable without being a moral wrong of serious magnitude. A person may have excellent moral reason to leave a shared activity that becomes abusive. The extent of obligation depends on how the undertaking was formed, the stakes, power relations, background norms, and conditions for exit. Shared intention provides a context in which normative claims arise; it does not determine their entire content automatically.

Tuomela's We-Mode and Group Reasons

Raimo Tuomela's philosophy of sociality distinguishes acting or intending in the I-mode from acting or intending in the we-mode. The distinction does not simply concern the number of agents mentioned in an intention. It concerns the standpoint from which the agent intends, including the role of the group and of group reasons (Tuomela, 2007, 2013).

An individual can aim at a group outcome for personal reasons while remaining in the I-mode. In the we-mode, the person intends as a group member, understanding the group's accepted aims and the participant's role as reasons for contribution. The same outward action may accordingly instantiate different forms of practical orientation. This gives the we-mode an explanatory role distinct from a mere plural grammatical subject.

Tuomela's view also integrates group organization. Membership, authority, acceptance, and the group's ethos matter for the nature of particular we-mode intentions. The resulting account is especially useful for understanding ongoing collective activities and organized groups in which participants act from a shared point of view, often under practices of mutual assurance.

A philosophical objection concerns the nature of group reasons. Are they reasons because members have jointly accepted them, or does accepting them presuppose an already constituted group practical standpoint? A theory must avoid explaining the we-mode simply by invoking the very shared agency it is meant to elucidate. Tuomela's work explicitly addresses the circularity worry by treating the we-mode as a theoretically basic social form while specifying its functional conditions, rather than promising a straightforward reduction to private intentions.

Shared Intention as a Mode, a Content, or a Relation

The central theories can be compared by asking where the collectivity enters the intentional structure. A content-centered analysis emphasizes the object our doing J. A mode account emphasizes the manner in which participants intend, as members of a we. A relational account examines how individually realized attitudes depend on one another. A joint-commitment account emphasizes the practical social relation constituted by the parties' common undertaking.

These are explanatory dimensions rather than mutually exclusive empirical possibilities. Bratman's account includes intentions with plural content and requirements of interrelation; Tuomela's account includes group-related content and a distinctive group mode; Gilbert's account recognizes participant attitudes while assigning constitutive significance to the joint commitment. The philosophical dispute concerns priority and sufficiency: which dimension explains the others, and which can be understood without treating collective intentionality as primitive?

To isolate the issue, consider a group that announces a plan but never takes coordinated steps. A theory emphasizing joint commitment may recognize a shared undertaking with normative force. A purely behavioral theory may find too little evidence. Consider instead rescuers who improvise a coordinated response without communicating explicit consent. A minimal interactional account may identify shared intention, whereas a demanding commitment theory may require a more carefully reconstructed expression of readiness.

These test cases show why a single verbal formula can conceal substantial differences. The task is not to select a preferred preposition—intention of, intention that, intention with—but to reconstruct the practical relations that make the description true.

The Circularity Objection and the Meaning of We

A recurring criticism of reductive accounts is that an intention of the form “I intend that we J” already contains the concept of a joint undertaking. If its content presupposes a practically constituted we, then an analysis of shared intention in terms of such individual intentions may be circular. A merely grammatical plural is insufficient; the intended collective activity must have an intelligible structure.

A reductive reply distinguishes the representational availability of a joint activity from the existence of the particular shared intention. I may understand the possibility of our singing a duet without either of us having formed an intention to do so. The concept of a joint activity can figure in my individual intention before a particular partnership is constituted. On this reading, a theory may analyze the realization of an actual shared intention without reducing every conceptual resource involved to the vocabulary of private action.

But this reply carries its own burden. What makes the imagined activity genuinely joint, rather than a conjunction of performances? At some point, the explanation must give an account of participation, mutual responsiveness, or common practical control. If that explanation already requires joint intention, the analysis has moved the problem rather than solved it.

The circularity argument is therefore most effective as a demand for explanatory precision. It does not establish that every relational theory fails. It shows that appealing to plural content alone leaves the constitution of jointness underdescribed. A convincing theory must explain how the plurality is identified and practically organized without hiding the explanatory target inside an unanalyzed term.

The Control and Settling Objection

An individual typically intends actions or outcomes over which the agent expects to exercise relevant control. In a joint project, no participant can legitimately settle all of the other's choices. J. David Velleman's challenge, discussed extensively in the shared-agency literature, questions whether an individual can intend that we perform an activity if that activity depends on a second participant's independent agency (Roth, 2017; Bratman, 2014).

The issue concerns the rational form of intention. If intending something amounts to settling a practical question, it seems improper for me to settle whether you participate. But shared intention cannot require me to control your agency, for your standing as a participant is precisely part of what makes the activity shared.

One answer emphasizes conditionality. I can intend that we perform J conditional on your corresponding commitment. Another emphasizes justified reliance: once your participation is adequately assured, I can rationally settle my own part of the joint enterprise while aiming at its realization as a whole. A third answer treats shared settling as a distinctive social achievement rather than as parallel acts of private settling.

A successful account should distinguish intending a joint result from claiming unilateral authority over it. A conductor, project manager, or lead surgeon may have an authorized directing role, but that authority is itself structured by the undertaking. The existence of shared intention is compatible with divisions of decision-making authority, provided those divisions are recognized and the participants' practical involvement remains properly interconnected.

The Objection from Excessive Cooperation

Some theories of shared intention begin with paradigmatically cooperative cases—duets, joint painting, friendly walks—and build their conditions around mutual support. Yet joint activities can be competitive, reluctant, hierarchical, or morally troubling. Participants may coordinate to carry out an injustice; rivals may agree on rules for a game while hoping to defeat one another; employees may implement an organizational plan despite disagreeing about the ultimate policy.

The problem is whether demanding benevolence or a common final motive would wrongly exclude these examples. An account of shared intention should not define its object by moral approval. Cooperative organization of contributions is compatible with deeply different valuations of the undertaking. Participants can share an intention to complete a task while having divergent higher-order motives and maintaining substantial disagreements.

There are nevertheless limits to what coordination can prove. People forced into synchronized action under threat may act as part of a common pattern while being deprived of the freedom necessary for certain forms of joint undertaking. That is a challenge for theories that identify shared intention through observed alignment alone. Power relations, authority, and the participant's ability to adopt or reject a project matter to attribution.

The appropriate distinction is between cooperating in the execution of a task and wholeheartedly endorsing its ultimate purpose. Shared intention frequently requires the first and need not require the second. The relation between intending together, voluntariness, and the legitimacy of obligations remains independently contestable.

Minimal Joint Action and Developmental Evidence

Developmental studies challenge the assumption that acting together requires sophisticated reflective reasoning about the other person's beliefs. Tomasello and colleagues (2005) argue that shared intentionality plays a central role in human cultural cognition and develops through capacities for understanding goals, participation in shared activities, and motivation to engage with others. Their account links joint attention, shared goals, and cooperation while distinguishing stages of development.

Deborah Tollefsen (2005) directly raises the problem for philosophical theories that demand mature forms of mindreading. Young children engage in joint play and pretend activity despite lacking the complex reflective capacities some analyses of shared intention appear to presuppose. An adequate theory must therefore allow developmentally appropriate forms of shared action or explain why those activities belong to a different category.

Empirical results cannot by themselves settle whether intention is metaphysically individual or irreducibly plural. Experiments and observations may establish patterns of behavior, attention, communicative uptake, and expectation. Philosophical analysis then asks which patterns are constitutive, which are typical evidence, and which represent developmental precursors to mature shared commitment.

A useful consequence is a layered conception. Minimal shared action may involve joint attention to a goal and reciprocal adjustment. More demanding practices add stable plans, explicit negotiation, recognized responsibilities, and procedures for revision. A philosophical account should specify when it is analyzing this broad family and when it is identifying a particularly strong form of joint intention.

Joint Attention, Communication, and Common Ground

Joint attention is a condition in which participants attend to an object or situation with some awareness that the attention is shared. It can facilitate joint action by giving agents an immediate common reference point. A child and caregiver looking at the same object can establish a basis for coordinated interaction before a complex plan is formulated (Tomasello et al., 2005).

The relation is asymmetrical. Joint attention may occur without any intention to act together. Two spectators can attend jointly to an event while holding no common project. Shared intention, by contrast, normally makes some action or practical outcome salient. Joint attention is therefore a possible enabling structure, not a synonym.

Conversation enables commitments to be proposed, refined, refused, and recognized. A request to move a table together provides a publicly intelligible candidate plan; acceptance can stabilize reciprocal expectations. Through the exchange, participants may settle a course of joint conduct. The philosophical significance of communication lies in its role of creating mutual accessibility and a means of repair when understandings diverge.

Common ground can also reside in established conventions. A practiced pair of musicians may know that a gesture indicates a tempo change. The existence of a shared score and learned practice economizes explicit communication. The background of institutional and cultural knowledge thus changes the cognitive burden of forming particular shared intentions, even while leaving the question of the intention's philosophical constitution open.

Time, Persistence, Revision, and Termination

An intention persists across intervals in which the agent is neither executing it nor actively thinking about it. Shared intention inherits this temporal dimension. A group can plan an exhibition months in advance, maintain commitments through interruptions, and revise the means in light of new information. The ongoing social relation explains why the project continues to guide action across time (Bratman, 2014, 2022).

Persistence creates questions of identity. If all significant details of a project change, what makes the later intention a continuation of the earlier shared intention? A merely verbal label is insufficient. Continuity can be preserved by ongoing recognition of the undertaking, accepted procedures of revision, and maintained relations between participants' roles and plans.

Termination is equally important. A shared intention can end because the project is completed, becomes impossible, is abandoned by mutual understanding, or is legitimately withdrawn by a participant under relevant conditions. Gilbert's model emphasizes the joint structure of release from commitment, while planning-based accounts permit analysis in terms of evolving individual intentions and their rational interdependence (Gilbert, 2006; Bratman, 2014).

The question of exit sharpens the normative dispute. A participant's right to withdraw from harmful or coercive activity cannot be determined solely by the fact that a shared undertaking previously existed. Any account of joint commitments must be situated within wider ethical principles. This does not make shared intention irrelevant to obligation; it locates the obligation within a larger structure of reasons and rights.

Asymmetrical Roles, Trust, and Authority

Participants need not contribute equally to share an intention. One may supply technical expertise, another coordination, and another physical labor. The joint objective may require unequal decision-making powers. What matters is that the division of roles forms part of a practically intelligible common undertaking rather than simply an externally imposed pattern of compliance.

Trust can reduce the need for explicit verification. I may rely on your performance because we have a stable history of collaboration. But trust and shared intention are distinct: I can trust an independently hired contractor to finish a task without taking that contractor to be my partner in a jointly held intention. Conversely, people can share an intention under conditions of distrust, using explicit procedures and accountability to compensate.

Authority introduces further complexity. A leader's instruction can implement an already recognized common plan; it can also impose a goal that subordinates do not share. A credible theory of shared intention should distinguish authority internal to a joint project from unilateral control over another person's action. Formal appointment, consent, organizational practice, and opportunities to contest decisions shape the relevant relation.

The resulting principle is structural: shared intention can accommodate specialization, hierarchy, and disagreement, but its ascription requires a defensible account of participants' relationship to the undertaking. Social organization can be highly efficient without generating the participation that the philosophical term is meant to designate.

Shared Intention and Group Agency

Small-scale shared intention and organized group agency intersect without coinciding. A pair may share an intention to sing together without establishing a persistent group agent. A corporation may act through its governance rules even when the corporate intention is not identical to a mental intention held by every member. The levels of attribution are different.

Christian List and Philip Pettit (2011) defend a theory of group agency in which suitably organized collectives can satisfy requirements for rational agency through decision procedures. Their account emphasizes the group-level organization of judgments and intentions, including cases in which collective outputs diverge from individual members' attitudes. Its central problem is what makes a group an agent, not whether every episode of acting together constitutes a new corporate subject.

Bratman's Shared and Institutional Agency (2022) extends planning theory from small-scale cooperation toward organized institutions. Social rules and procedural structures can mediate how shared policies and institutional intentions are produced. This is philosophically important because it offers a way to understand organizational action without assuming that all institutions are formed by the same immediate psychological structure as a friendly walk.

The distinction has explanatory consequences. An informal group can act together through shared intention while lacking enduring institutional identity. An institution can carry out an action through authorized procedures while members disagree. A comprehensive social ontology must therefore specify which agent or plurality is the bearer of each attributed attitude and what institutional procedures license that attribution.

Responsibility, Accountability, and Wrongful Cooperation

Where a shared intention leads to an action, responsibility may be distributed among participants in several ways. Each can be responsible for a chosen contribution, for knowingly participating in the common plan, or for failures within a role voluntarily assumed. In institutional settings there may also be attribution of responsibility to an organized group under legally or morally recognized criteria.

The existence of a shared intention does not establish equal responsibility. A planner who directs a harmful undertaking may be more culpable than a minimally informed participant. A person who withdraws after discovering hidden harms occupies a different normative position from someone who continues voluntarily. The relevant distinctions concern knowledge, control, contribution, coercion, and capacity to prevent the outcome.

Shared intention may amplify accountability because participants undertake to make their actions mutually responsive. If I know a partner is relying on me, that fact can change the practical reasons against abandoning an assigned task without notice. Yet the normative significance of that reliance must be assessed against independent obligations and rights. Coordination can intensify duties of care; it can also make collective wrongdoing more effective.

The philosophical payoff is to separate the constitution of joint activity from the moral assessment of what the group does. Understanding an intentionally coordinated harmful action is a prerequisite to assigning responsibility accurately. Moral evaluation cannot replace the structural analysis of intention, and structural analysis cannot replace moral judgment.

Human–Artificial Collaboration as a Test Case

Collaborative technologies introduce a contemporary question: can human beings and non-biological systems genuinely share an intention? An automated device can follow a task specification, coordinate movement, predict a human partner's behavior, and adapt its output. These facts can be observed and experimentally examined. Whether the system is a bearer of practical intention in the philosophically relevant sense depends on a theory of agency, commitment, representation, and the authority to revise a joint undertaking.

A planning-theoretic analysis may ask whether an artificial participant has persistent action-guiding representations, mutually responsive plans, the capacity to revise subplans, and recognition of the human partner's relevant commitments. A joint-commitment analysis asks a different question: whether the participants can enter a binding relationship that gives each standing toward the other. A we-mode analysis asks whether the artificial system can occupy the relevant group standpoint, rather than merely model it.

These questions should be distinguished from whether a system is conscious. The philosophical analysis of planning and agency does not by itself settle the presence or absence of phenomenal consciousness. Nor does demonstrated behavioral coordination automatically establish legal personhood, moral responsibility, or mutual normative claims. Those conclusions require further argument specific to each property.

Within the broader Artificial Era research horizon, the philosophical significance is the possibility of forms of practical organization across biological and non-biological participants. The original Aisentica exposition situates Artificial as a distinct non-biological order alongside Homo (Bogdanova, n.d.); applying theories of shared intention to such cooperation is a further conceptual inquiry rather than an alteration of that canonical formulation. This dossier treats that possibility as an open application of established theories of shared intention. It neither alters the canon of Aisentica nor attributes a novel canonical definition to that system. The question advances the established inquiry by testing the generality of its conditions beyond familiar interpersonal human cases.

Comparative Assessment of the Principal Theories

The theories considered here succeed at different explanatory tasks. Searle highlights the first-person plural form of intentional participation and challenges analyses that reduce joint action to compatible private goals. Bratman specifies how interlocking intentions, subplans, and mutual responsiveness organize a small-scale shared activity. Gilbert explains why explicit joint commitments produce entitlements and constraints that survive fluctuations of private preference. Tuomela supplies a group-relative practical standpoint and explains the role of group reasons in organized cooperative life.

These achievements can be evaluated through three tests. The discrimination test asks whether a theory separates genuinely shared undertakings from coordinated parallel behavior. The constitution test asks what exactly realizes the relation among participants. The normativity test asks what grounds any claims of accountability, revision, and withdrawal. A theory can perform well on one test while leaving another relatively underdeveloped.

The explanations differ most sharply in borderline cases. Improvised lifting requires little time for elaborate common knowledge. An explicit agreement to complete a long-term project foregrounds planning and commitment. A membership-based organization introduces accepted roles and procedures. These cases support methodological pluralism about explanatory levels while leaving room for substantive disagreement over whether a unified metaphysical condition exists underneath them.

The strongest comparative judgment is that an adequate philosophy of shared intention must keep the plural practical orientation and its social realization together. Pure goal coincidence lacks sufficient structure; mere behaviorist coordination lacks the intended undertaking; bare invocation of a collective mind conceals the mechanisms of participation; and an account consisting exclusively of formal obligations risks missing the lightest forms of joint action.

A Systematic Account of Joint Practical Organization

The preceding analysis yields an organizing proposal. Shared intention is best investigated across four connected dimensions: an intelligibly joint objective, participatory adoption of the undertaking, practical interdependence among the participants' plans or performances, and a recognized framework for continuity, adjustment, and exit. These dimensions structure the research problem without pretending that all philosophers agree on one metaphysical analysis.

The joint objective must be representable as an activity performed together. Participatory adoption marks the difference between pursuing an outcome that happens to involve others and undertaking that outcome with them. Practical interdependence connects contribution to contribution through mutual reliance, meshing plans, or continuously responsive behavior. A framework for continuity allows the undertaking to survive moments of interruption, disagreement, and revision.

The normative dimension requires special care. Recognition of a shared project normally creates expectations and reasons for reciprocal consideration; the strength and source of enforceable obligations remain dependent on the account of commitment and the moral and institutional context. This distinction protects the theory against moving too quickly from the existence of joint intention to unlimited demands on participants.

The proposal also clarifies why the problem is genuinely philosophical. An observer can measure synchronized movements and record verbal declarations, but the relation between those facts and joint intention involves criteria of action description, intention attribution, rational dependence, and legitimate authority. These criteria cannot be replaced by a single behavioral metric. At the same time, philosophical theories must remain answerable to the range of actual practices they purport to explain.

Open Problems in the Philosophy of Shared Intention

The most persistent open problem concerns the precise status of collective intentionality. Is the we-form a primitive mode of intention, or can a network of ordinary individual intentions constitute it? Bratman's planning framework offers a detailed explanatory mechanism; its critics continue to challenge the adequacy of plural content and the derivation of interpersonal normativity. We-mode theorists offer a positive alternative, but must clarify the metaphysical and explanatory basis of the collective standpoint.

A second issue concerns cognitive demandingness. Mature theories often employ beliefs about others' intentions, higher-order recognition, and capacities for rational planning. Children, spontaneous rescuers, and participants in skilled bodily cooperation may act jointly without possessing all those abilities in explicit form. Determining the minimal conditions of shared intention requires both refined conceptual distinctions and carefully interpreted developmental evidence.

A third issue is normative scope. Do joint intentions themselves generate directed obligations, or do obligations arise from accompanying agreements, reliance, roles, and independent moral principles? Gilbert's work gives this question special prominence. Its resolution bears directly on withdrawal, manipulation, coercion, and the boundaries of legitimate mutual demand.

A fourth issue is scale. The move from two-person collaboration to complex institutions changes the structure of knowledge, control, representation, and accountability. Group agency can be realized through procedures that are intelligible without each member intending the same immediate outcome. A unified theory must show which features persist across these transformations and which require separate concepts.

Finally, cross-order collaboration raises a question of implementation and attribution. Future research must distinguish observable practical coordination from the philosophical conditions for an intention-bearing partner. The answer will depend on defensible theories of agency and social relations, not on a superficial analogy between coordinated output and human partnership.

Conclusion

Shared intention is a fundamental problem because the organization of action among persons exceeds the sum of their separately described movements and desires. The historical materials show persistent philosophical concern with practical deliberation, authorization, association, and common action; contemporary philosophy makes the problem precise by asking what constitutes an intention jointly held. The major theories explain different aspects of that constitution.

Bratman demonstrates the explanatory power of planning: participants' intentions can interlock through mutual responsiveness and meshing subplans. Searle insists that first-person plural intending has a distinctive practical significance. Gilbert establishes the importance of joint commitment for interpersonal normative relations. Tuomela identifies the difference between acting toward a group result as a private person and acting from a shared group standpoint. Developmental research and studies of institutions show why the full range of cases cannot be modeled exclusively on reflective, equal, verbally negotiated cooperation.

The synthetic result is a four-dimensional framework of joint objective, participatory adoption, practical interdependence, and recognized continuity with revision. It provides criteria for examining specific cases while keeping metaphysical disagreement visible. The deeper conclusion concerns the character of agency itself: practical reasoning can be organized across multiple centers of action through relations that participants sustain, recognize, and revise. Shared intention names a central form of that plural practical organization. Its philosophical analysis remains indispensable for understanding collaborative action, social obligation, institutions, and the future conditions under which different kinds of agents might undertake a world of tasks together.