In a cyclical design process, repeating the steps to refine after testing is called what?

• A. Revision
• B. Verification
• C. Development
• D. Iteration

Answer: (D)

Iteration is about looping back to the earlier stages of the design cycle after testing to refine and improve the product. When a test reveals how the design falls short or how it can be better, you return to the design decisions—dimensions, materials, processes, or features—and make adjustments, then test again. This repeating sequence continues until the design meets the requirements. It contrasts with revision, which is just making changes to improve something without necessarily re-running the full cycle; verification, which is checking whether the design meets the set criteria; and development, which is the broader act of creating and evolving the product, not specifically the repeated cycle after testing.