What is the primary purpose of the Spiral Model in software development?

The primary purpose of the Spiral Model in software development is to control risk associated with software development. This model emphasizes iterative development, allowing teams to build software incrementally through repeated cycles (or spirals). Each iteration involves four main phases: planning, risk analysis, engineering, and evaluation, allowing for continuous refining of the project.

By focusing on risk management, the Spiral Model helps to identify potential problems early in the development process. Each cycle includes a risk assessment phase, where the team can evaluate the project's current status, identify new risks, and develop strategies to mitigate them. This approach is particularly advantageous for large and complex projects, where the stakes are higher and risk factors can significantly impact the outcome.

While aspects like user interface design, database performance, and code readability are important in software development, they are not the primary focus of the Spiral Model. The model’s strength lies in its structured method of tackling risks, ultimately leading to more successful project outcomes.