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When applying the spiral model, the customer and the executors make a thorough risk analysis of the project and implement it in iterations. Each successive stage builds on the previous one. At the end of each iteration cycle, a decision must be made as to whether or not to proceed with the development.
The model began to be used back in 1988. It is similar to the incremental variant, but the emphasis here is on the assessment of all kinds of risks. Each new spiral cycle makes the process more and more complex.
Advantages:
Focus on risk analysis.
Disadvantages:
Chances of getting too caught up in the very initial stage of development.
Increased cost and duration of development.