A sales territory is a grouping of customers and prospects assigned to an individual salesperson. There are several reasons for establishing and revising sales territories, including providing proper market coverage, controlling selling expenses, assisting in evaluating sales force personnel, contributing to sales force morale, and aiding coordination of selling and advertising efforts. When designing sales territories, a basic geographical unit is selected and sales potential is determined for each unit. Units are then combined into tentative territories with approximately equal sales potential. Territories are adjusted based on differences in coverage difficulty to equate incremental sales per dollar of selling expenditures among territories. Assigning sales personnel considers differences in ability and effectiveness in different territories. Routing and scheduling aims to optimize coverage and minimize wasted time.