Life Cycle Models

• The software development life cycle produces software with the highest quality in the most efficient way, shortest time and lowest cost.
  
   
  
  There are five stages of the SDLC:

• Planning and Requirement Analysis

  This is to identify the scope of the project, determine the feasibility and plan for the required resources

• Defining Requirements

The scope of work necessary to define, analyze and document business and end-user requirements.

• Designing the Product Architecture

  Developers must devise a design approach for the software architecture that will undergird the product's functionality

• Developing the product

  Building the system, integrating and testing the units into larger components and providing a technical environment for the system.

• Testing the product

  Evaluating the system or its components with the intent to find whether it meets the requirements or not.
  
   
  
  Life cycle Models:

• Waterfall

  Tasks are performed sequentially

• Evolutionary Development including rapid prototype

System is developed in increments so that it can be readily modified in response to end-user and customer feedback.

Reuse-oriented

• Understands old components which can be reused
• Understands all system components
• To modify old components to achieve new requirements

• Agile

  Delivers working software products in small increments while adapting to customer needs and feedback.
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  ADVANTAGES	DISADVANTAGES
  Flexible	Uncertainty
  Low risk factor	Lack of predictability