A study of computer engineering tool integration using the Portable Common Tool Environment (PCTE) Public Interface Standard is presented. Over a 10-week time frame, three existing software products were encapsulated to work in the Emeraude environment, an implementation of the PCTE version 1.5 standard. The software products used were a computer-aided software engineering (CASE) design tool, a software reuse tool, and a computer architecture design and analysis tool. The tool set was then demonstrated to work in a coordinated design process in the Emeraude environment. This paper describes the project and the features of PCTE used, summarizes experience with the use of Emeraude environment over the project time frame, and addresses several related areas for future research. Introduction Background With the rapid development of digital processing technology, NASA programs have become increasingly dependent on the capabilities of complex computer systems. Current flight control resear...