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The Information System Design and Optimization System (ISDOS), under development at the University of Michigan, offers automated assistance for the design of information processing systems (IPS). The Problem Statement Language (PSL) and Problem Statement Analyzer (PSA) are the components of ISDOS which are used for IPS requirements definition and analysis. This report describes the ISDOS project in general and the concepts, capabilities, and use of PSL/PSA. The report also describes future PSL/PSA development plans and makes recommendations for a detailed study to determine PSL/PSA's functional value.