Which stages are part of the Validate Phase?

The Validate Phase is crucial in engineering design as it focuses on verifying that the solution meets the intended requirements and functions as expected. The stages that are typically part of this phase include testing and evaluation. During this time, prototypes are subjected to various tests and evaluations to assess their performance against criteria set during earlier phases of development. This process helps ensure that any flaws or issues are identified and addressed before moving forward with implementation or production.

In the context of the other options, while developing, refining, analyzing, or summarizing designs may be involved in earlier phases or other aspects of the design process, they do not specifically constitute the core activities of validation. Validation is distinctively characterized by the rigorous testing of solutions to confirm their efficacy and reliability, which is why focusing on testing and evaluation is the correct approach for this phase.