Reengineering for CASE tool-IDEF0-MAKER

The reengineering steps for a CASE tool called IDEF0-MAKER include analyzing and decomposing the original system, designing abstract frameworks and putting the decomposed subsystems into the frameworks. A new technology, design patterns, has been applied to this work. The consequences of using these patterns are successful: they improve the understanding, maintainability, reusability and evolution of our software.