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Design patterns have recently received much attention in the object‐oriented community. Their main strengths are identified as providing a high‐level design vocabulary and serving as better documentation of a design. This article reports a design experience using patterns which indicates that patterns significantly increase the communication effectiveness among team members; however, the same experience also illustrates that the current practice of informal patterns usage in a design leaves room for improvement. For example, by explicitly representing patterns and keeping them up to date with the developer's design, we can significantly increase the quality of the design and alleviate many maintenance problems. This article also describes a tool to support such a pattern‐based design process. © 1996 John Wiley & Sons, Inc.

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In1983, Rome Air Development Center (RADC) published "Report on a Knowledge-Based Software Assistant" [Green, et a1 831.This document brought together key ideas on how artificial intelligence (AI) could be used in the software development process. Since then RADC has embarked on the first of three contract iterations to develop both a Knowledge-Based Software Assistant (KBSA) and the enabling supporting technologies which are necessary. KBSA is a formalized computer-assisted paradigm for the development, evolution, and long-term maintenance of computer software. KBSA captures the history of system evolution.It provides a corporate memory of: how parts interact, what assumptions were made and why, the rationale behind choices, how requirements are satisfied, and explanation of the development process. KBSA accomplishes this through a collection of integrated dedicated facets.