When it is needed
There is a real product idea, but not every feature belongs in version one.
- You have a defined user problem but need help deciding what the first useful product should do.
- A long feature list is making it difficult to start, estimate or explain the product clearly.
- You need a working product to test a customer journey, service model or commercial assumption.
- An early product exists, but the core experience needs to be simplified before the next stage of investment.