“Logic will not change an emotion, but action will.”
So many OSS projects get bogged down in logic, discussions, technical pontification, etc.
But in my experience, a month of discourse can be replaced by a week of doing, especially when the customer is using COTS (ie commercially available off the shelf solutions). Or in the case of one project that I worked on, 18+ months of discourse and approvals was delivered in less than two weeks of doing.
Rapid prototyping forces the delivery team to crash through all the real barriers rather than what-if scenarios dreamed up in the logic stage of a project. Sure, a high-level design needs to be done but in most cases it shouldn’t take months to complete and approve. A rapid prototype breaks down the what-if questions and forces the team to work with a smaller sub-set of actual issues, not to mention identifying real issues that nobody envisaged in the logic stage.