The measure of usefulness of an early customer conversation is whether it gives us facts about our customers' lives and world views.
Opinions are worthless. You want facts and commitments.
Product-market fit means being in a good market with a product that can satisfy that market.
The key to successful product development is to test your hypotheses with real customers as quickly as possible.
We must learn what customers really want, not what they say they want or what we think they should want.
