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This report describes the requirements, design, and implementation of a software package that can be used to perform quantitative studies on certain aspects of the programming task. Of specific interest will be experienced with the level of interactiveness of the human-computer interface relating to identifier scope-rules. The software package for the conduct of those experiments is an interactive programming-environment called PEEP. Its base language is Pascal and its design is based on a semantic model of computation. Storage representations and the implementation of these semantic models are described. The model depicts the compile-time structure, run-time structure, and realization of the static and the dynamic scoping-rules. (Author)