CHOlVlSKY'S Aspects (1965) and go a long way towards explicit representation 368 WAR~N J. PI~ATI-I of the meanings of sentences in a notation that bears certain strong resemblances to the predicate calculus. Among the motivations for our choice of approach are 1) the advantages of a transformational model as a vehicle for capturing significant linguistic generalizations, 2) the relative case of interpretation of our abstract underlying structures, and 3) the perspicuity of a system organization which separates data from algorithms and represents linguistic rules direcdy as units, rather than as discontinuous elements that are distributed over networks or programs. 2. OVERALL SYSTEM ORGANIZATION The current version of the REQUEST System consists of a set of programs written in Lisp 1.5, tog...

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