Specifications reuse process modeling and case study-based evaluations

The software reusability-based development process and reusable objects modeling are discussed. The supporting tools environment which allows both the developer and user to carry out requirement definitions, specification, and implementation in a reusable way, is described. Some quantitative evaluations are given about how productivity and quality have been improved by using this environment, based on the results of a number of case studies made at development sites. Reusability has been largely improved by a software specification adjustment method, called differential specification, and the direct transformation capability offered in the environment