This document provides information about adding usability testing to your skill set. It discusses why usability testing is important, what rapid usability testing entails, different testing methods, and the preparation and process for conducting an unmoderated usability study. Key steps include defining goals, preparing materials like tasks and recruitment, setting up the test environment, observing and analyzing participant videos, and reporting findings to stakeholders. Conducting even a small number of tests can uncover major usability issues.