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In syntax directed speech recognition communication between the acoustic and syntactic processors of the system causes the acoustic analyzer to evaluate only those grammatically correct word hypotheses generated by the syntax analysis algorithm. In this paper we discuss two such systems which are much faster, but no less accurate than, systems in which the acoustic and syntactic analyses are sequential and isolated. Theoretical details of the systems are given and experimental results of tests are presented. Finally we discuss methods for using syntax directed recognition to improve overall system accuracy. We also show the relevance of one of our methods to the recognition of connected speech.