Theory and Practice of Enhancing a Legacy Software System

Citation

Calder M, Magill E, Reiff-Marganiec S & Thayananthan V (2002) Theory and Practice of Enhancing a Legacy Software System. In: Henderson P (ed.) Systems Engineering for Business Process Change: New Directions - Collected Papers from the EPSRC Research Programme. London: Springer, pp. 120-137. http://link.springer.com/chapter/10.1007/978-1-4471-0135-2_8

Abstract
Telephone switching systems are an interesting class of legacy system as they are complex, distributed and safety critical. As with most legacy systems, a simple replacement is impossible (or at least impractical), therefore changes in business practice and technology have induced a perpetual evolution of telephone switching systems.