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I sketch my general model of the roles of intentions in the planning of agents like us-agents with substantial resource limitations and with important needs for coordination. I then focus on the stability of prior intentions: their rational resistance to reconsideration. I emphasize the importance of cases in which one's nonreconsideration of a prior intention is nondeliberative and is grounded in relevant habits of reconsideration. Concerning such cases I argue for a limited form of two-tier consequentialism, one that is restricted in ways that aim at blocking an analogue of Smart's concerns about rule-worship. I contrast this with the unrestricted two-tier consequentialism suggested by McClennen. I argue that my restricted approach is superior for a theory of the practical rationality of reflective, planning agents like us. But I also conjecture that an unrestricted two-tier consequentialism may be more appropriate for the AI project of specifying a high level architecture for a resource-bounded planner.

In these essays, Hugh J. McCann develops a unified perspective on human action. Written over a period of twenty-five years, the essays provide a comprehensive survey of the major topics in contemporary action theory. In four sections, the book addresses the ontology of action; the foundations of action; intention, will, and freedom; and practical rationality. McCann works out a compromise between competing perspectives on the individuation of action; explores the foundations of action and defends a volitional theory; argues for a libertarian view of both the formation and the execution of intention; and considers the question of consistency in rational intentions, as well as the relationship between practical and theoretical reasoning.

Among the original features of McCann's work are his defense of both fine- and coarse-grained actions and his arguments for a noncausal theory of the relation between intention and action. He also suggests that intentions need not be consistent, either with each other or with beliefs about success. And he contends that intention formation is an intrinsically ratiocinative procedure, distinct from reasoning about what action would be best.

Abstract: Practical deliberation is deliberation concerning what to do governed by norms on intention (e.g. means-end coherence and consistency), which are taken to be a mark of rational deliberation. According to the theory of practical deliberation I develop in this paper we should think of the norms of rational practical deliberation ecologically: that is, the norms that constitute rational practical deliberation depend on the complex interaction between the psychological capacities of the agent in question and the agent's environment. I argue that this view does a better job of justifying particular norms for practical deliberation than intrinsic or constitutivist theories. Finally, I argue against the Myth Theory of deliberation, which takes there to be no such norms on deliberation.

Practical reasoning is a process of reasoning that concludes in an intention. One example is reasoning from intending an end to intending what you believe is a necessary means: 'I will leave the next buoy to port; in order to do that I must tack; so I'll tack', where the first and third sentences express intentions and the second sentence a belief. This sort of practical reasoning is supported by a valid logical derivation, and therefore seems uncontrovertible. A more contentious example is normative practical reasoning of the form 'I ought to φ, so I'll φ', where 'I ought to φ' expresses a normative belief and 'I'll φ' an intention. This has at least some characteristics of reasoning, but there are also grounds for doubting that it is genuine reasoning. One objection is that it seems inappropriate to derive an intention to φ from a belief that you ought to φ, rather than a belief that you ought to intend to φ. Another is that you may not be able to go through this putative process of reasoning, and this inability might disqualify it from being reasoning. A third objection is that it violates the Humean doctrine that reason alone cannot motivate any action of the will. This paper investigates these objections.

Practical reasoning is a process of reasoning that concludes in an intention. One example is reasoning from intending an end to intending what you believe is a necessary means: 'I will leave the next buoy to port; in order to do that I must tack; so I'll tack', where the first and third sentences express intentions and the second sentence a belief. This sort of practical reasoning is supported by a valid logical derivation, and therefore seems uncontrovertible. A more contentious example is normative practical reasoning of the form 'I ought to φ, so I'll φ', where 'I ought to φ' expresses a normative belief and 'I'll φ' an intention. This has at least some characteristics of reasoning, but there are also grounds for doubting that it is genuine reasoning. One objection is that it seems inappropriate to derive an intention to φ from a belief that you ought to φ, rather than a belief that you ought to intend to φ. Another is that you may not be able to go through this putative process of reasoning, and this inability might disqualify it from being reasoning. A third objection is that it violates the Humean doctrine that reason alone cannot motivate any action of the will. This paper investigates these objections.

Michael Bratman''s restricted two-tier approach to rationalizing the stability of intentions contrasts with an alternative view of planning, for which all of the following claims are made: (a) it shares with Bratman''s restricted two-tier approach the virtue of reducing the magnitude of Smart''s problem; (2) it, rather than the unrestricted two-tier approach, is what is argued for in McClennen (1990); (3) there does not appear to be anything in the central analysis that Bratman has provided of plans and intentions (both in his book,Intention, Plans, and Practical Reason, and in the article Planning and the Stability of Intention) that precludes his adopting this alternative approach; and (4) it is an approach that neither requires nor encourages any distinction between the standards appropriate to artificial and to human intelligence.

In this article, I first elaborate and refine the Principle of Intention Agglomeration (PIA), which was introduced by Michael Bratman as “a natural constraint on intention”. According to the PIA, the intentions of a rational agent should be agglomerative. The proposed refinement of the PIA is not only in accordance with the spirit of Bratman’s planning theory of intention as well as consistency constraints for intentions rooted in the theory, but also reveals some deep rationales of practical rationality regarding resource-limited agents. Then I defend the PIA against various objections and counterexamples, showing that the refined PIA survives attacks based on both conceptual analyses and psychological considerations.

Cognitivism about practical reason is the view that intentions involve beliefs, and that the rational requirements on intentions can be explained in terms of the rational requirements on the beliefs that figure in intentions. In particular, cognitivists about practical reason have sought to provide cognitive explanations of two basic requirements of practical rationality: a consistency requirement, according to which it is rationally impermissible to have intentions that are jointly inconsistent with one’s beliefs, and a means-end coherence requirement, according to which, to a first approximation, it is rationally impermissible to intend an end while failing to intend what one regards as a necessary means to this end. In order for the cognitivist to explain these requirements, she must arrive at an account of the beliefs that figure in intentions, on the basis of which she can show that any agent who violates these requirements of pratical rationality must have beliefs that violate the requirements of theoretical rationality. Providing such an account, however, turns out to be no easy task.

The practical thought of planning agents is subject to distinctive rationality norms. In particular, there are norms of intention consistency and of means-end coherence. I discuss the normative significance of these norms and their relation to practical reasons. I seek a path between views that see these norms as, at bottom, norms of theoretical rationality, and views that see the idea that these norms have distinctive normative significance as a 'myth'. And I seek to distinguish these norms from principles about the transmission of practical reasons. In the end, my view draws on claims about what is involved in being a self-governing planning agent.

What happens to our conception of mind and rational agency when we take seriously future-directed intentions and plans and their roles as inputs into further practical reasoning? The author's initial efforts in responding to this question resulted in a series of papers that he wrote during the early 1980s. In this book, Bratman develops further some of the main themes of these essays and also explores a variety of related ideas and issues. He develops a planning theory of intention. Intentions are treated as elements of partial plans of action. These plans play basic roles in practical reasoning, roles that support the organization of our activities over time and socially. Bratman explores the impact of this approach on a wide range of issues, including the relation between intention and intentional action, and the distinction between intended and expected effects of what one intends.