software development life cycle

software development life cycle

1. INCREMENTAL LIFE CYCLE MODEL

   • REQUIREMENTS
     • DESIGN
       • IMPLEMETATION AND UNIT TESTING
         • INTEGRATION AND SYSTEM TESTING
           • OPERATION
   • The Incremental life cycle model builds an iterative approach into the Waterfall model. Development projects are divided into several smaller, more manageable iterations. Each iteration passes through a mini-Waterfall process. Requirement, design, implementation and testing phases are completed for each iteration.

2. SPIRAL LIFE CYCLE MODEL

   • PLANNING
     • RISK ANALYSIS
       • ENGINEERING
         • EVALUATION
           • CUSTOME EVALUATION
             • PROJECT COST
         • CODING
           • TESTING
       • RISK ANALYSIS
         • PROTOTYPING
     • REQUIREMENTS GATHERING
   • The Spiral life cycle model is similar to the Incremental model but incorporates risk analysis. It is divided into four phases: planning, risk analysis, engineering, and evaluation. A project passes through each of these phases in sequence, repeatedly, in a series of iterations called spirals. At the beginning of the development process, critical requirements are identified for the first spiral. Subsequent spirals add functionality to this baseline spiral.

3. V-SHAPED LIFE CYCLE MODEL

   • REQUIREMENTS
     • HIGH LEVEL DESING
       • LOW LEVEL DESING
         • IMPLEMETATION
           • UNIT TESTING
             • INTEGRATION TESTING
               • SYSTEM TESTING
                 • SYSTEM TEST PLANNING
               • INTEGARTION TEST PLANNING
             • UNIT TEST PLANNING
   • Like the Waterfall model, the V-Shaped life cycle model provides a sequential path of discrete phases that must each be completed before development proceeds to the next phase. The phase test plans are developed during each level of development, and once coding is completed, the tests are conducted. Figure 4-3 is a simplified illustration of the V-Shaped life cycle model.

4. SOFTWARE DEVELOPMENT LIFE CYCLE MODEL

   • REQUIREMENTS
   • DESIGN
   • IMPLEMENTATION
   • TESTING

5. WATERFALL LIFE CYCLE MODEL

   • REQUIREMENTS
     • During the requirements-gathering phase,
     • DESIGN
       • IMPLEMETATION AND UNIT TESTING
         • INTEGRATION AND SYSTEM TESTING
           • OPERATION
   • The Waterfall life cycle model, model, also known as the classic or linear-sequential life cycle model, is one of the simplest to understand and use. The Waterfall model is characterized by a series of steps that must be completed in a linear, sequential order. Each phase is completed and verified before development progresses to the next phase

6. The term software development life cycle model is a way of describing the planning,designing, coding, and testing of a software system, as well as the method in which these steps are implemented A variety of life cycle models exist, but they all include the same constituent parts. All life cycle models take a project through several primary phases: a requirements-gathering phase, a design phase, a construction or implementation phase,and a testing phase.

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