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Q

During customer development phase, how many people should you talk to in testing your assumptions? Is 1000 enough? Or if you send a prototype that has rousing success, should you move into developing the service? Or is more cust dev needed?

Customer Development is an iterative algorithm. You never stop doing customer development. You ship while you do it.

The question about when to stop any particular hypothesis test is a very important one and is one of the hardest to answer. It very much depends on the test. Ultimately, the goal is convergence to an outcome. If you are talking to people face-to-face, you start seeing the same points over and over. If you are doing a high-volume online test then you may want to run two separate groups and end the test when you see them converge (the idea here is that random effects would have disappeared by then).

You can find some more info about hypothesis testing on my blog.

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