Marketing research, conducted for the purpose of new product development or product improvement, is often concerned with identifying the consumer's "unmet needs." Customer needs are central to market segmentation which is concerned with dividing markets into distinct groups of buyers on the basis of "distinct needs, characteristics, or behaviors who might require separate products or marketing mixes." Needs-based segmentation (also known as "benefit segmentation") "places the customers' desires at the forefront of how a company designs and markets products or services." Although needs-based segmentation is difficult to do in practice, it has been proved to be one of the most effective ways to segment a market. In addition, a great deal of advertising and promotion is designed to show how a given product's benefits meet the customer's needs, wants or expectations in a unique way.