Employers in Saskatchewan are grouped based on their industrial undertaking, which is the work, trade or service a business is in. The classification structure consists of three levels: classes, industry groups, and rate codes. Premium rates are set at the rate code level. For example, if your primary business activity is operating a charter bus service, you would be part of the Transportation class, in industry group T4, which is part of rate code T42 – Transportation, Courier, Commercial Bus rate. The classification structure has 10 classes, 33 industry groups and 50 rate codes.