This document provides an overview of Lean UX, which combines principles from design thinking, agile development, and the lean startup methodology. It discusses Lean UX foundations like continuous learning and experimentation. The Lean UX process involves declaring assumptions, creating minimum viable products (MVPs) to test hypotheses, gathering feedback through research and experiments, and iterating based on learning. Challenges like integrating Lean UX with scrum processes and finding user test subjects are also addressed. The document aims to explain what Lean UX is and how its principles and processes work.