Creating software of any kind is an enormously expensive proposition, whether for internal use or commercial application. The range of activities involved in engineering and creating software are mind-boggling in complexity. Yet, every time new software is developed, most programmers start from scratch without considering what might be re-used or salvaged from existing programs. Re-Engineering Software addresses the principles, approaches, support systems, underlying methodologies, and real case examples for re-using (and thus building on) previously existing software.