The document discusses the importance of closure in lessons. It states that closure should (1) reinforce the lesson objective and (2) check for student understanding. Effective closure activities include answering questions, addressing what was learned and its significance, and having students demonstrate their achievement or progress towards the objective. An example of a good closure activity is an exit pass where students respond to a posed question, summarize what they learned, or ask their own questions. Closure provides teachers with instant feedback to improve instruction.