So, the business of salesperson evaluation can be a challenge for a number of reasons. First, each salesperson is an individual and can have differing levels of experience, different kinds of customers or sales territories, and different kinds of competition. This makes comparing sales performance a bit tricky. Secondly, often time, salespeople work alone. This makes monitoring their performance difficult. A sales manager may see a salesperson just once a month. It can be difficult to assess how the salesperson is doing their job. Finally, a salesperson can have conflicting responsibilities. For example, look at account maintenance, which is taking care of current customers, versus account development, which is getting new customers. An hour spent taking care of current customers is one less hour that can be spent getting new customers. This affects the output of a salesperson and ultimately, their performance evaluation. This is why it is so important to have very specific job descriptions.