This document discusses Lean UX methods for startups. It introduces Lean UX as an approach that treats every design decision as a hypothesis that needs to be tested. It outlines nine key Lean UX methods: 1) Declaring assumptions, 2) Writing tests, 3) Minimum viable products, 4) Getting out of the building to talk to customers, 5) Dump and sort synthesis, 6) Making models, 7) Sketching, 8) Pairing, and 9) Getting out of the building again. Each method is then briefly described in more detail with examples. The overall summary is that Lean UX provides lightweight, low-cost methods for startups to test their design hypotheses with customers and iterate quickly.