Systematic collection and analysis of student data can help improve teaching by providing insight into what students know and how they learn. Classroom assessment techniques (CATs) have several advantages: (1) they are formative and provide feedback to teachers while the course is ongoing; (2) they are quick to administer and grade; (3) they can be tailored to each instructor's needs; and (4) they can be anonymous for students while still providing feedback on learning. When designing CATs, teachers should keep them simple, focused on collecting only necessary data, and explain their purpose to students. Assessment should be integrated into teaching and learning to fully benefit instruction.