One of the most powerful tools in your marketing toolbox is a case study or a case history. It's real-world proof that you actually know how to service your clients and keep them coming back for more. Sometimes it's hard to step back and take a look at what you've done, and accurately portray it. Take a look at this article that conveys some excellent tips on how to write a case study, plus they offer a template you can use to develop your own case histories.