Running Lean: Iterate from Plan A to a Plan That Works (Lean (O'Reilly))

(solution).

Just as rushing to build a solution can lead to waste, so can prematurely picking a customer segment or business model.

worth solving.

(problem statement

Your job isn’t just building the best solution, but owning the entire business model and making all the pieces fit.

back-of-the-envelope

let customers find you organically, while outbound channels rely

believe that if you intend to charge for your product, you should charge from day one.

The one thing you should never outsource is learning about customers.