Final answer:
The Agile development method incorporates test design in all the stages of the SDLC, emphasizing iterative testing and revisions.
Step-by-step explanation:
Development Methods Incorporating Test Design
The development method that incorporates test design in all the stages of the Software Development Life Cycle (SDLC) is the Agile development method. Unlike the Waterfall development model, which is sequential and doesn't encourage going back to a previous phase, the Agile model is iterative and emphasizes continual testing and revision. In Agile, testing is integrated from the beginning and throughout the project lifecycle, enabling teams to identify issues early and adapt the product according to the feedback. This approach can be likened to the spiral design process, where prototyping and evaluation are iteratively conducted to refine the design based on improved understanding and test results. Agile methodologies such as Scrum and XP (Extreme Programming) put a strong focus on testing and incorporate it as a fundamental aspect of every phase, including planning, design, development, and deployment.