I call this, “Don’t worry, be crappy” approach—inspired by Bobby McFerrin’s song “Don’t Worry, Be Happy.” Eric Ries, author of The Lean Startup, calls this the minimum viable product (MVP).
Ries explains the MVP concept in this way: It is not necessarily the smallest product imaginable, though; it is simply the fastest way to get through the Build-Measure-Learn feedback loop with the minimum amount of effort. The goal of the MVP is to begin the process, not end it.