SOFTWARE LIFE CYCLE

SOFTWARE LIFE CYCLE

1. Software Development life cycle

   • Testing
     • Test phase
   • Implementation
     • execution
   • Requirements-gathering
     • the needs of the company are detailed.
   • Desing
     • In the design phase

2. Spiral

   • Spiral life cycle model
     • 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
       • Advantage: the software code develops early; therefore, the client has many opportunities to evaluate the software and a lot of time to facilitaet the adoption of the software.
       • Disadvantages : The spiral model can cost much more to implement than other models of life cycle , The spiral model is not suitable for use in small and medium-scale projects that are not mission critical.

3. Vistope

   • V-shaped life cycle Mode
     • Like the Waterfall model, the V-shaped life cycle model provides a sequential path of discrete phases that must be completed before the development goes to the next phase.
       • Advantage: Like the Waterfall model, the V-shaped model is relatively simple and easy to use , The specific objectives are defined for each phase.
       • Disadvantages The rigidity of the V-shaped model makes it unsuitable for most projects. , Like the Waterfall model, the V-shaped model is inappropriate for complex Projects.

4. incremental

   • incremental life cycle mode
     • The Incremental life cycle model builds an iterative approach into the Waterfall model. Development projects are divided into several smaller, more manageable iterations
       • Advantages: The Incremental model is an effective tool for managing risk , Chancy portions of development can be identified and carefully managed in their own iteration.
       • Disadvantages: Incremental model may incur errors in early iterations , but it may be inappropriate for large, long- term projects.

5. waterfall

   • Waterfall life cycle mode
     • The Waterfall life cycle model, also known as the classic or linear-sequential life cycle
       • disadvantages: Waterfall is inappropriate for complex projects, it should not be used to develop object-oriented software
       • Advantages: the Waterfall model is simple and Easy to use , The Waterfall model is appropriate for small development projects in which the requirements are well understood

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