The document describes a workshop on agile usability testing through user checks. User checks involve testing a design with real users within their context and retesting after improvements within one week. This allows testing early and often to improve the design iteratively based on user feedback. The workshop covers how to structure user check sessions, including introducing tasks, observing users and evaluating findings after each session to prioritize improvements for retesting. Volunteers then do a practice user check session with observers collecting feedback on sticky notes to discuss findings and potential design updates.