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This article describes a prototype program visualization (PV) enviromnent that we have developed. The prototype is an "umbrella" in the sense that it is not targeted to support any one software development methodology. Rather, it provides basic PV tools that can be used in the service of the programmer's chosen methodology. Our system was designed to support progmming in C, although large portions ofit are independent of the software development language. The prototype itself is implemented in C and runs on a VAX 11/780 under UCB Unix Version 4.2.