Pushouts in Software Architecture Design

Taylor L. Riché, Rui Gonçalves, Bryan Marker, and Don Batory

A classical approach to program derivation is to progressively extend a simple specification and then incrementally refine it to an implementation. We claim this approach is hard or impractical when reverse engineering legacy software architectures. We present a case study that shows optimizations and pushouts - in addition to refinements and extensions - are essential for practical stepwise development of complex software architectures.