The widespread use of computer technology over several decades has resulted in some large, complex systems that have evolved to a state where they significantly resist further modification and evolution.
These Legacy Information Systems are normally mission-critical: if one of these systems stops working the business may grind to a halt.
Thus for many organizations, decommissioning is not an option. An alternative solution is Legacy System Modernization which has recently become an important research and practical issue. This paper presents an approach to mission-critical Legacy System Modernization.
