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Chapter 2 Software Life Cycle

Building automation describes the functionality provided by the control system of a building. A building automation system (BAS) is an example of a distributed control system. The control system is a computerized, intelligent network of electronic devices, designed to monitor and control the mechanical and lighting systems in a building. | Chapter 2 Software Life Cycle CONTENTS 2.1 INTRODUCTION.3 2.2 PROCESS DESCRIPTION.3 2.2.1 Life cycle Models.4 2.2.1.1 Waterfall Model.4 2.2.1.2 Incremental Model.5 2.2.1.3 Evolutionary Model Prototyping .6 2.2.1.4 Spiral Model.7 2.3 APPLICATION.9 2.3.1 evolutionary Acquisition and spiral development.9 2.3.2 Selection Matrix.10 2.4 LIFE CYCLE CHECKLIST.11 2.4.1 Beginning a development project.11 2.4.2 development project is under Way.12 2.5 REGULATIONS.12 2.6 REFERENCES.12 2.7 RESOURCES.12 2.7.1 Software Life Cycle.12 2.7.2 Software Acquisition Development.13 Februay 2003 2-1 Chapter 2 Software Life Cycle Condensed GSAM Handbook This page intentionally left blank. 2-2 Februay 2003 Chapter 2 Software Life Cycle 2.1 Introduction In the early days of computing software was developed by many individuals following their own methods. Often the methods employed some form of code and fix where the programmer writes some code and then tests it to see how it performs. The programmer then uses the test results to modify or fix the code and tests again. Programmers were able to get by with this type of development for two reasons. First no better way had been developed and second software was not that complex. As software grew more complicated and organizations relied on computers for more of their operations including finances and even human lives this laissez faire approach to programming gave way to more disciplined methods. The overall framework in which software is conceived developed and maintained is known as the Software Development Life Cycle SDLC . This chapter discusses the various types of SDLCs along with their advantages and disadvantages. A life cycle model defines the phases milestones deliverables and evaluation criteria of the software development process. These form the basis of the work breakdown structure WBS used for project planning and management. 2.2 Process Description Life cycles are usually referred to as models and define the phases of a software .