In order to generate predictable revenue, businesses need to focus on four key sales roles: market development, product development, customer success, and inside sales. Market development involves creating demand for the product or service through marketing initiatives. Product development involves creating a product or service that solves a specific problem for the target market. Customer success involves ensuring that customers are able to use the product or service successfully and get maximum value from it. Inside sales is the process of selling a product or service from an office, instead of traveling to meet with potential customers.