One of the first steps in good problem solving is being able to correctly identify what kind of problem one is dealing with in order to determine the appropriate principles and techniques needed to solve the problem. To do this, students must be able to look beyond surface differences among problems and perceive underlying similarities. In this activity, students work in pairs, looking at examples of common problem types in order to identify the particular type of problem each example represents. In this way, students support each other as they try to increase their efficiency and effectiveness in problem solving by learning to generalise problem types instead of seeing problems as isolated exemplars.