This document provides guidance on conducting usability testing to improve product design. It recommends: 1) Conducting speed tests with users to understand behaviors and issues; 2) Building a tester community from real users to provide feedback; 3) Testing frequently with small groups to incorporate feedback early. It outlines when and what to test, how to prepare by determining goals and tasks. It provides a testing protocol, including introducing yourself, having users think aloud, and asking questions without justifying designs. The key is to listen, take notes on positive and negative experiences, and use the insights to reinforce successes and address problems.