Formal Technical Review (FTR) - Software Engineering | Lecture 58 

Based on the description and the rationale provided, the Spiral Model was used in the question. This model is particularly effective for projects where the requirements are not well understood from the beginning and where significant risks need to be managed continuously through iterative refinement. The Spiral Model, introduced by Barry Boehm in 1986, is a risk-driven process model that combines elements of both iterative and waterfall models. It is designed for large, complex, and high-risk projects. Each iteration begins with planning and ends with the customer evaluating the progress and deciding on the next steps. The process is visualized as a spiral, where each loop represents a phase in the process.