This approach of estimating competiton from customer judgements, asks customers to take a large set of products and divide them into groups of items

This approach of estimating competiton from customer judgements, asks customers to take a large set of products and divide them into groups of items that can be substituted for one another and them to judge the similarity of the similarrity of the products in each group. a0 judge overall similarity b)similarity within consideration sets c)product delection d)Substitution in use sets e)perecptual mapping