Practitioner

Method Support for Software-System Evolution

By: Ian Warren, D. Avallone (Contribution by), M. Breuer (Contribution by)

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Paperback | 6 February 1999

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200 Pages

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24.77 x 16.51 x 1.91

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Today, software professionals recognize that change in software systems is inevitable. There are many systems currently in operation, however, which were developed before the need for change was understood. Such systems are commonly referred to as "legacy systems", and were developed with relatively short lifetimes in mind. Software engineering is a relatively young discipline which is continually improving to provide better support for the development of software systems. What were once state-of-the-art techniques, tools, and processes are now dated, and have resulted in systems which are not responsive to change. For historical reasons, dated development practice traded maintainability for other system attributes, such as cost and performance. A significant number of legacy systems remain in operation because they are critical to the business processes which they support. The combination of extended lifetimes and poor maintainability means that legacy systems are expensive to change, and in many cases they cannot accommodate emerging requirements. This is clearly an undesirable situation, which, until recently, has been tackled by replacing the system or attempting to maintain it. Replacing a legacy system is dangerous, since you face the risk of losing vital business knowledge which is embedded in many old systems. In many cases, system replacement is not cost-effective. Conversely, if you attempt to maintain a legacy system, there is often little return on the investment in maintenance effort and the system remains difficult and expensive to change.

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Non-Fiction Computing & I.T.Computer Programming & Software Development Software Engineering Software Testing & Verification Engineering & Technology Electronics & Communications Engineering Electronics Engineering Automatic Control Engineering Business Applications Computer Hardware Maintenance & Repairs

Preface	p. xi
Background	p. 1
Legacy Systems	p. 2
System Change	p. 6
System Evolution	p. 9
References and Further Reading	p. 14
Renaissance: a Method for System Evolution	p. 17
The Process Model	p. 18
Information Management	p. 29
Responsibilities	p. 32
Method Customization	p. 32
The Method Framework	p. 34
References and Further Reading	p. 38
Evolution Planning	p. 39
Legacy System Assessment	p. 43
Evolution Strategies	p. 48
Cost Estimation and Risk Assessment	p. 54
Evolution Project Planning	p. 58
References and Further Reading	p. 60
Modelling for Evolution	p. 63
Context Modelling	p. 65
Technical Modelling	p. 75
Traceability in System Modelling	p. 80
References and Further Reading	p. 83
Migration to Distributed Architectures	p. 85
Distributed Architectural Models	p. 87
System Integration Models	p. 92
References and Further Reading	p. 105
Case Study 1: Evolution of a Legacy System	p. 107
Background	p. 109
Scenario 1: Evolution Strategy Development	p. 113
Scenario 2: Evolution Strategy Implementation	p. 131
References and Further Reading	p. 143
Case Study 2: Evolution of a Modern System	p. 145
Overview	p. 147
Legacy System Investigation	p. 152
Target System Definition	p. 157
Evolution Strategy Development	p. 160
Target System Modelling	p. 164
Further Reading	p. 165
Appendices
Online Software Reengineering Resources	p. 171
Tool Vendors	p. 175
Implementation Technology Vendors	p. 177
Index	p. 179
Table of Contents provided by Syndetics. All Rights Reserved.

Practitioner

Method Support for Software-System Evolution

At a Glance

Paperback

Shipping

How to return your order

Defective items

You Can Find This Book In

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