The Renaissance of Legacy Systems

Many antiquated or legacy systems are still in operation today because they are critical to the organizations continued operations or are prohibitively expensive to replace. This book guides practitioners in managing the process of legacy system evolution. The author introduces a comprehensive method for managing a software evolution project, from its conception to the deployment of the resulting system. The book helps managers answer two critical decisions: What is the best way to evolve a particular legacy system? and How can the legacy system be migrated to a selected target architecture?

Contenu

1. Background.- 1.1 Legacy Systems.- 1.2 System Change.- 1.3 System Evolution.- References and Further Reading.- 2. Renaissance: a Method for System Evolution.- 2.1 The Process Model.- 2.2 Information Management.- 2.3 Responsibilities.- 2.4 Method Customization.- 2.5 The Method Framework.- References and Further Reading.- 3. Evolution Planning.- 3.1 Legacy System Assessment.- 3.2 Evolution Strategies.- 3.3 Cost Estimation and Risk Assessment.- 3.4 Evolution Project Planning.- References and Further Reading.- 4. Modelling for Evolution.- 4.1 Context Modelling.- 4.2 Technical Modelling.- 4.3 Traceability in System Modelling.- References and Further Reading.- 5 Migration to Distributed Architectures.- 5.1 Distributed Architectural Models.- 5.2 System Integration Models.- References and Further Reading.- 6. Case Study 1: Evolution of a Legacy System.- 6.1 Background.- 6.2 Scenario 1: Evolution Strategy Development.- 6.3 Scenario 2: Evolution Strategy Implementation.- References and Further Reading.- 7. Case Study 2: Evolution of a Modern System.- 7.1 Overview.- 7.2 Legacy System Investigation.- 7.3 Target System Definition.- 7.4 Evolution Strategy Development.- 7.5 Target System Modelling.- Further Reading.- Appendices.- A Online Software Reengineering Resources.- B Tool Vendors.- C Implementation Technology Vendors.