Using object classification activities to exercising important thinking skills! Example: The category is Food. Think of an object in this category that begins with each letter of the alphabet. As students create categories using words and pictures, they develop analysis, discrimination, comparison, and logical thinking skills. The 22 lesson pages featured here pose classification problems - first on a simple, concrete level and then progress to more abstract activities. With these step-by-step exercises, children are sure to give their logic and thinking muscles a good workout.