Abstract
Designer's Workbench, based on the PWB/UNIX <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">∗</sup> operating system, is a software system that provides a high level interface to the circuit design aids used within Bell Laboratories. As well as providing a convenient environment for the use of these applications, a primary goal in the design of DWB was to provide a convenient and versatile environment in which programmers could work. This paper describes the objectives that were defined to reach this goal. The approach was to simplify the addition of new capabilities to the system, realizing that a viable design-aids system must be able to expand with the increased demand for and complexity of the applications it supports. We discuss in detail the methods and mechanisms used in the development and implementation of the system. Although some of these are specific to the functions required by DWB, the general philosophies that are emphasized can be applied to provide a programming environment for any software system.
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