A retail audit is a permanent sample of shops chosen to represent total retail trade. Data collected from this panel on a regular basis provides information about a product's sales and distribution. Retail audits should be used as a tool for making better and less risky decisions, and are useful for both sales and marketing people as well as general management in providing a summarized overview. A retail audit answers the key questions of who, where, when, and what - providing information about manufacturers, brands, locations, time periods, and metrics like sales, purchases, distribution, and market shares.