Which process improves the traditional waterfall model by incorporating PDCA sub-stages throughout the SDLC?

The Spiral Method is recognized for its incorporation of iterative and incremental processes into software development, improving upon the traditional waterfall model. By integrating the Plan-Do-Check-Act (PDCA) sub-stages throughout the Software Development Life Cycle (SDLC), the Spiral Method allows for continuous refinement and adaptation of the software being developed.

In practical terms, this means that each iteration or "spiral" starts with planning, followed by developing and testing the product, and concludes with evaluating the results. This cyclical approach enables teams to adjust designs and implementations based on feedback and risk assessment, ultimately leading to better risk management and more adaptive designs.

In contrast, the other models such as the Agile Model focus directly on collaboration and flexibility but do not emphasize the stepwise approach of the PDCA cycle throughout the entire SDLC in the same way. The V-Model is more about the validation and verification process structure and is more rigid than the Spiral Method. Rapid Application Development (RAD) emphasizes the speed of development but lacks the iterative risk management that characterizes the Spiral Method. Thus, the Spiral Method stands out as the model that effectively incorporates the PDCA framework into its workflow, fostering a responsive and iterative development process.