Getting Things Done is a system to help us be more organized and productive. It basically turned into a popular movement during the early 2000's. David Allen says we can feel in control of our busy work lives, simply by learning to manage our daily tasks effectively.
The Lean Startup shows how to achieve business success by learning what customers want fast. Eric Ries explains how to launch a minimum viable product, why you should ignore vanity metrics, and how to use 'split-testing' to avoid wasting years of your life building a product nobody wants.