Castañeda's views on intention are distinctive, and they deserve greater attention than they have recently received.  For instance, he holds that intentions and beliefs are structurally parallel in the following key respect.  Both involve the endorsing of an appropriate type of structured content.  When a person believes that P, she endorses or accepts the proposition that P; when a person intends to F, she endorses or accepts the practition, ‘I [am] to F.’ Roughly a practition ascribes an action property F to an agent, but the ascription involves a distinctive type of predication that essentially carries some kind of imperative force. Orders, commands, and requests all have practitions as their contents as well, but, as a rule, these will represent prescriptions directed at others.  They express the content, e.g., ‘You [are] to F.’ An intention is, by contrast, self-directed, but it is not only that the intended practition is self-directed in this sense; in intending the agent conceives of himself under a distinctively ‘first person’ conception.  Other philosophers, e.g., Hare [1971] and Kenny [1973] have likened intentions to self-directed commands. Still others, notably Annette Bair [1970], have wanted to construe the logical objects of intending as non-propositional and as represented by an unmodified infinitive. Versions of both of these ideas are worked out more carefully and extensively in some of Castañeda's key writings on action. Castaneda was concerned to assign a systematic semantics to the chief locutions that figure in practical thinking and reasoning.  These include ascriptions of belief and ascriptions of intention, but they also include the varieties of ‘ought’ statements that make explicit the normative character of practical reflection.  It was a chief ambition in his investigations to chart out the structure of implicative relations that hold between propositions and practitions of these varied sorts and thereby to elaborate the conceptual foundations of deontic logic. (For a rich exegesis of Castañeda on action see essay 12 in Bratman 1999.)