1. Visit your local grocery store and go through the cereal, snack-food, and dental hygiene aisles. Go up and down each aisle slowly, noticing how many different products are available and how they are organized on the shelves.
2. Count the varieties of product in each product category. For example, how many different kinds of cereal are on the shelves? How many different sizes? Do the same for snack food and toothpaste.