%0 Report %@ 486 %A Cohen, Philip R. and Levesque, Hector J. %T Performatives In A Rationally Based Speech Act Theory %C 333 Ravenswood Ave., Menlo Park, CA 94025 %I AI Center, SRI International %D 1990 %K Natural Language!Performatives, Natural Language!Speech act theory %X A crucially important adequacy test of any theory of speech acts is its ability to handle performatives. This paper provides a theory of performatives as a test case for our rationally based theory of illocutionary acts. We show why ``I request you...'' is a request, and ``I lie to you that p'' is self-defeating. The analysis supports and extends earlier work of theorists such as Bach and Harnish  and takes issue with recent claims by Searle  that such performative-as-declarative analyses are doomed to failure.