The document introduces a new metric called the Team Engagement Score (TES) to measure team engagement during usability testing. TES is calculated based on three components: observation of usability sessions, collaboration during testing, and engagement level while observing. Several scenarios are provided to demonstrate how TES is calculated in different situations. The document discusses how TES could be used to track and improve team engagement over time, but also notes limitations since engagement is difficult to fully quantify. The presenters seek feedback on whether TES is a useful metric and how team engagement could best be measured.