Program interface reengineering for wrapping

The paper describes a technique for reengineering program interfaces as a prerequisite to wrapping them. Program wrapping is used to encapsulate old software components in a new object-oriented architecture. For this the programs must have well defined interfaces which contain all of their global data. Program interface reengineering as described in the paper is a means to achieving that end. It has been used by the author to prepare an ATM booking system for wrapping. The result was not only reusable objects but also more maintainable programs.