A focused, well-trained sales force marks the difference between business success and failure. Proven sales strategies can take only a few weeks to master, yet the return on investment can not be exaggerated. There are a variety of services that offer industry-specific sales training to countless enterprise clients. When choosing a sales training solution, be sure to check if the service offers training customizable to your needs, if they have other clients in your industry, and if they offer small business or enterprise discounts.