<Ol> <Li> Scoping </Li> <Li> Build business case </Li> <Li> Development </Li> <Li> Testing and validation </Li> <Li> Launch </Li> </Ol> <Li> Build business case </Li> <Li> Testing and validation </Li> <P> Ahead of this process there is often a preliminary phase called ideation or discovery, and after the fifth phase the process typically ends with the post-launch review . Major new products go through the full five - phase process . Moderate risk projects (such as extensions and enhancements) often use a reduced 3 - phase version, which combines the scoping with the business case phase, and developing with the testing phase . Very simple changes (such as a marketing request) may be executed using a light two - phase process, where the launch is rolled into development and testing too . </P>

During which stage of the product development process would a feasibility study be most useful