This document provides an introduction to Lean UX and UserTesting. It defines UX and Lean UX, discusses the benefits of user testing such as increased revenue and decreased costs, and outlines the UserTesting process including defining objectives, writing tasks, analyzing results, and using metrics and notes. UserTesting allows remote, unmoderated usability testing of digital products through video recordings of testers interacting with designs. The document provides tips for effective user testing through UserTesting.