This document discusses the role of formative assessment in inquiry-based learning. It explains that formative assessment involves gathering evidence of student achievement and using that evidence to enhance performance by adjusting teaching methods. The key aspects of formative assessment are obtaining evidence of student understanding through methods like observation and questioning, interpreting that evidence to evaluate progress towards educational goals, and providing feedback to help students take next steps. The overall goal of the session is to help participants design a formative assessment strategy to gather learning evidence for a student-centered chemistry lesson.