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With software maintenance costs averaging 50% of total computing costs, it is necessary to have an effective maintenance program in place. Aging legacy systems, for example, pose an especially rough challenge as veteran programmers retire and their successors are left to figure out how the systems operate. This book explores program analyzers, reverse engineering tools, and reengineering tools in-depth and explains the best ways to deploy them. It also discusses using XML-based tools, the roles of software components, object technology, and metaprogramming in improving systems maintenance, as...

Code clones are recurring similar program structures. Several techniques exist to detect similar code fragments (simple clones) for better software maintenance, but further gains can be obtained by by detecting similar classes, source files or directories. Structural clones embody such large-granularity, design-level similar program structures that often map to design or application domain concepts. Detection of structural clones leads to a better understanding of the design of the system, easing software maintenance, evolution, and re-engineering. Unification of structural clones ...