Further define the product, the manufacturing requirements, a project plan, and estimated revenues. Stage 3: Development. A prototype or prototypes are developed. Stage 4: Testing and Validation. The prototype is tested. If there is a problem, the team goes back to the development stage. If it works, the product can be prepared for Stage 5. Stage 5: Launch. A marketing strategy is developed and the product is made available to customers. How about a real-world example? Here's a Stage-Gate approach from the Centers for Disease Control (Links to an external site.) Note how much more complex it is compared to the version we use in this course. It is included here just so you can get an idea of how much this model can expand and be used not only for product development but also project management. IT may also give you ideas of items to include in your Stage- Gate assignment. Part 2