This document provides an overview of user testing for product managers. It discusses how user testing involves having users perform tasks to evaluate a product's usability and ease of use. The document notes that while user testing can be expensive and time-consuming, it is important for identifying problems. It then outlines the roles and responsibilities of facilitators and observers during a user testing session. The facilitator's job is to keep the user comfortable and on track while encouraging them to think aloud, while avoiding helping or judging. The observer documents points of confusion and potential issues without jumping to solutions. The document concludes by providing examples of tasks and debrief questions.