Check out Pivot, Patch, or Persevere (I Patched the Lean Startup) by Jurgen Appelo. Here is an excerpt:
The Lean Startup model was incomplete. But now I patched it.
Your life as an entrepreneur is perfect!
Investors are begging for the privilege of funding your venture; team members are never sick and never fighting, and ecstatic customers fling money at you while making love to your product all…