CATs are tools that can be used for active learning, assessment, and feedback. CATs are often anonymous and ungraded, and can give you a picture of how students are progressing in your class. At the same time, they give you information on your teaching and its effectiveness. This session will focus on those CATs that are especially easy to use, such as the minute paper, categorizing grid, and muddiest point, and those that will work in large classes as well as small ones.