3 Rules for Building Features in a Lean Startup
Validated learning about customers is the measure of progress in a Lean Startup – not lines of working code or achieving product development milestones.
So lets take a look at where in the product development process do we do this type of learning:
Where we learn about customers
While some learning happens during the requirements stage (driven by customer development activities), most of the learning happens only after we ship a release, with very little learning during development and QA.
via ashmaurya.com
Yet another excellent post by Ash Maurya. This one covers how to approach the development cycle within a lean startup.