Performance attributes are those for which more is normally better, and will be improving customer satisfaction. Conversely, an absent or weak performance attribute reduces the customer satisfaction. Of the needs customers verbalize, most will fall into the category of performance attributes. These attributes will form the weighted needs against which product concepts will be evaluated. The price for which customer is willing to pay for a product is closely tied to performance attributes. For example, customers would be willing to pay more for a car that provides them with better fuel economy.