Because of the complex and dynamic nature of marketing phenomenon, demand forecasting has become a regular and significant business exercise. It is necessary for profit maximisation and the expansion and survival of a business. Though before selecting any vendor a retailer must well understand importance and requirement of demand forecasting. In management circles, demand forecasting as well as sales forecasting are used interchangeably. Sales forecasts are first approximations in production and forward planning. These offer a platform upon that plans can be prepared and amendments can be made. According to American Marketing Association, 'Sales forecast is an estimate of sales in physical or monetary units during a specified future period under a proposed business plan or programmer or under an assumed set of 'economic and other planning premises, environment forces.