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A new requirements specification technique, Structured Stimulus Response, is presented in this paper. This technique is suitable for the specification of large, software intensive systems with complex data requirements. The Structured Stimulus Response technique may be seen as a synthesis of Structured Analysis and Use Case techniques. From Structured Analysis, this new technique inherits the concept of using a data dictionary to describe the vocabulary for the requirements specification as well as using various structural and notational constraints that may be checked automatically by a software tool. From the Use Case technique, this work inherits the concept of partitioning the specification from the user's perspective. The Structured Stimulus Response technique is presented in this work as a semi-formal requirement specification tech nique that may potentially serve as a framework to support the selective application of more formal techniques.