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The Spiral Model is characterized by its iterative approach, which combines elements of both design and prototyping in stages. This model emphasizes the repeated reassessment and refinement of the project through cycles or 'spirals', allowing for continuous feedback and enhancement. Each iteration of the cycle involves planning, risk analysis, engineering, testing, and evaluation, making it ideal for projects where requirements are likely to evolve.

The focus on risk assessment and iterative development is distinct from the other methods mentioned. For instance, the Waterfall Model is linear and sequential, meaning that each phase must be completed before moving on to the next, leaving little room for iteration once set stages are finished. Similarly, a Static Method typically refers to an unchanging approach, which does not accommodate ongoing feedback and improvement cycles. The Linear Approach is also straightforward and lacks built-in iterative processes, making it less adaptive to changes or advancements in the project's requirements.

Thus, the Spiral Model is the best fit for an approach that embraces iterative cycles for continual improvement.