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Spiral Model

The Spiral Model is a risk-driven process model generator for software development. It combines the elements of both Waterfall Model and Prototyping Model, aiming to provide a systematic approach to software development that can accommodate changes throughout the life cycle of the project.

History

The Spiral Model was first proposed by Barry Boehm in 1986. Boehm, an American software engineer, developed this model to address the limitations of the linear sequential models like the Waterfall Model, where changes could be expensive or difficult to implement once the project was underway. His work was published in the paper titled "A Spiral Model of Software Development and Enhancement," which introduced the idea of iterative development with risk analysis at each stage.

Context and Key Features

The Spiral Model is characterized by:

Phases of the Spiral Model

  1. Objective Setting: Specific objectives for the phase are determined, including performance metrics and constraints.
  2. Risk Assessment and Reduction: Risks are identified, prioritized, and strategies for risk reduction or mitigation are developed.
  3. Development and Validation: This phase involves the actual development of the software, including design, coding, and unit testing. Prototypes might be built to test concepts.
  4. Planning: The next iteration is planned, and the project is reviewed to ensure it meets customer expectations.
  5. Customer Evaluation: Customers evaluate the product at the end of each spiral to provide feedback.

Advantages

Disadvantages

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