This document discusses how to quickly assess student learning in one-shot library instruction sessions through the use of learning outcomes and short assessment instruments. It recommends drafting 2-5 learning outcomes focused on what students must accomplish and comprehend. Outcomes should be measurable and action-oriented. Assessment questions can then be created based on the outcomes. Several assessment tools are presented, like polls, games, and questionnaires that can be used within a 5 minute time frame to gauge student understanding. Reviewing responses and reflecting on results with students is also encouraged.