All of us have customers. If you are a freelance writer or instructional design consultant, you know how important it is to keep the customers you have happy.
If you are an in-house instructional designer or writer, you have customers too. Even though your customers are internal, it is just as important to keep them happy. If you deliver poorly written manuals or ineffective training, they will not want to spend their budget with you. They may complain to your boss or go outside of the company to hire someone.
Regardless if you have your own business or work for a company, it is easier to keep the customers you have instead of finding new customers. MHI Global wrote an article with a few tips on keeping your customers happy: What Do Customers Want? 4 Basic Things.