This document provides an overview of Lean UX and prototyping. It defines Lean UX as minimizing time rather than money through rapid iteration. Prototypes test design or technical hypotheses, while MVPs test business hypotheses. Paper, low-fidelity, high-fidelity, and functional prototypes are described for testing at different stages. Examples of successful MVPs like Groupon, Kickstarter, and the Palm Pilot are given. The workshop portion guides participants through sketching app ideas, critiquing, and prototyping the best concept in Marvel. Next steps depend on confidence levels and may involve a low or high fidelity prototype or functional prototype.