The maintenance of large information systems involves continuousmodifications in response to evolving business conditions or changing userrequirements. Based on evidence from a case study, we show that thesystems maintenance activity would benefit greatly if the processknowledge reflecting the...

Most large systems development efforts proceed in a top-down fashion where initialspecifications and requirements are incorporated into a high-level design, followed byprograms based on this design. However, a major part of the software life-cycle effort isdevoted to maintenance. While several...