Everyone--especially the rider--has a part in making eventing safer. In the March 2008 issue of Practical Horseman magazine, veteran eventing coach Jim Wofford outlines the following rating system to help you produce safe and effective riding. It should be applied with the help of an expert coach or horseman, if possible.
(The chart is in PDF format. If you have trouble viewing it, download the free Adobe Acrobat Reader program.)