What is the spiral model of software development?

The iterative model combines elements of the waterfall model and rapid development. Development proceeds in cycles, each consisting of four stages: planning, risk analysis, design, and implementation, evaluation.

Stage	Description
Planning	Defining project goals, alternatives, and constraints.
Risk Analysis	Assessing risks associated with each alternative and choosing the best risk management strategy.
Design and Implementation	Selecting a development model (e.g., prototyping, waterfall) and developing the product.
Evaluation	Assessing the results of the stage, planning the next spiral cycle.

Advantages:

• Flexibility, ability to make changes.
• Risk management at each cycle.
• Suitable for large and complex projects.

Disadvantages:

• High cost.
• Management complexity.
• Requires a qualified team.