Modernizing LegacySystems: Software Technologies, Engineering Processes, and Business Practices

“The potential impact of this book cannot be overstressed.
Software systems that are not continually and adequately evolved and,
in particular, legacy systems that have not been so maintained, can
threaten an organization’s very survival. I recommend the book as a
must for people directly involved in such evolution, whether as
customers, managers and resource providers, or as implementers.”

–M. M. Lehman, Emeritus Professor, Middlesex University

Businesses
inevitably face a critical choice in the design and maintenance of
their software systems: Dismantle older systems and completely replace
them, or incrementally modernize existing systems. Many businesses
choose the latter course, seeking to maximize their existing investment
and preserve valuable business knowledge, while adapting to rapidly
evolving technologies. Modernizing Legacy Systems is a
much-needed guide, showing how to implement a successful modernization
strategy and describing specifically a risk-managed, incremental
approach–one that encompasses changes in software technologies,
engineering processes, and business practices.

Key topics include:

• Making a case for modernization
• Understanding requirements and constraints
• Maintaining performance, data integrity, and security
• Designing and deploying the target architecture
• Migrating code and data
• Estimating costs
• Planning the modernization effort

For
every topic, this book presents current standards and available
products that support legacy system modernization. In addition, a large
retail-supply-system case study–a system written in COBOL being
modernized to one based on the J2EE architecture–runs throughout this
book to demonstrate a real-world legacy system modernization effort.

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