There exist many competing philosophical definitions of joint action and no clear criteria to decide between them; so far the search for definitions has by and large been a semantical enterprise rather than an empirical one. This chapter describes and assesses several constraints that could help converge towards a set of necessary and sufficient conditions for joint action. The tightness constraint favours definitions that fit joint actions in which the links between agents are as relaxed as possible, so as to (...) better pinpoint the conceptual core of jointness. The developmental constraint asks for definitions based on realistic psychological states that could be entertained by agents less cognitively developed than ideal human beings. The motor constraint holds that definitions should refer to psychological mechanisms involved in actual human coordination. These first three constraints are discussed and dismissed, mainly because they manage to establish vague limits at best (for various reasons). I then introduce a fourth one, the efficiency constraint, based on the fact that most of our joint actions are generally successful, and according to which definitions should involve conditions that help justify this success. Finally, the rational and evolutionary versions of the efficiency constraint are examined and defended against objections. (shrink)

This paper offers a critical discussion of Searle's account of collective intentionality. It argues Bratman's alternative account avoids some of the shortcomings of Searle's account, over-intellectualizes collective intentionality and imposes an excessive cognitive burden on participating agents.Tthe capacities needed to sustain collective intentionality are examined in an attempt to show that we can preserve the gist of Bratman's account in a cognitively more parsimonious way.

Two approaches to instrumental rationality Suppose I intend end E, believe that a necessary means to E is M, and believe that M requires that I intend M. My attitudes concerning E and M engage a basic requirement of practical rationality, a requirement that, barring a change in my cited beliefs, I either intend M or give up intending E.2 Call this the Instrumental Rationality requirement – for short, the IR requirement.

I’ve been told that there are two principal approaches to drawing figures from life. One begins by tracing an outline of the figure to be drawn, locating its edges and key features on an imagined grid, and then using perspective to fill in depth. The other approach proceeds from the ‘center of mass’ of the subject, seeking to build up the image by supplying contour lines, the intersections of which convey depth—as if the representation were being created in relief. The (...) second approach need not adopt a unified perspective, and is more concerned with evoking the volume and ‘presence’ of the subject than with accurate placement of edges and features. Call this second approach drawing ‘from the inside out’, meant to capture the living force of the subject rather than freeze it in a coordinate frame. (shrink)