What is system development model? Describe its types

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What is system development model? Describe its types.
System development models specify how the activities of the development process are organized in the total system development effort. Each model is designed for a specific purpose or reason that follows a particular life cycle but each may have similar goals and a common task.
There are four types of System Development Models

Waterfall Model

The waterfall model describes a system development method that is linear and sequential in nature following gradually downward similar to waterfall. It is easy to understand
Problem definition, Feasibility Study, Requirement Analysis, System Design, Coding and Testing, Implementation, System Maintenance

Prototype Model

A prototype is an early approximation of final system or product. This mode is useful to systems where requirements are not known in detail during the development. In this model customer can realize the system requirement after prototype is brought into operation. It allows more accurate, flexible design and development. It takes low cost in design and development time.

  • Start
  • Requirement Analysis Quick Design Prototype Building
  • Engineer The Product Refine Prototype User Evaluation
  • Stop

Spiral Model

It is an evolutionary model developed by Barry Boehm in 1986. Each iteration of the prototype is represented as a cycle in the spiral. This model is risk oriented. It is a combination of Prototype Model and Waterfall Model. This model is used for large expensive and complicated projects.
Planning, Risk Analysis, Engineering, Construction and Release, Custom evaluation, Customer Communication

Iterative Model

An iterative life cycle model does not attempt to start with a full specification of requirements. Instead, development begins by specifying and implementing just part of the software, which is then reviewed in order to identify further requirements.

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