-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.    

 -Count the varieties of products 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.    
 -Now try to find a type of product in the grocery store that does not exhibit such variety. There may not be many. Why do you think there are enough kinds of cereals to fill an entire aisle (and then some), but only a few different types of, say, peanut butter? Can this difference be explained in terms of marketing management philosophy (peanut butter manufacturers do not follow the marketing concept) or by something else entirely?    
 -Have you ever wanted to see a particular kind of cereal or snack food on the shelf? Think of product varietals (like grapefruit-flavored toothpaste or peanut butter–covered popcorn) that you have never seen on the shelf but would be interested in trying if someone would make it. Write a letter or send an e-mail to an appropriate company, suggesting that it add your concept to its current product line.