ISO 21308 describes general principles for the exchange of data between truck chassis manufacturers and bodywork manufacturers. It applies to commercial vehicles as defined in ISO 3833, having a maximum gross vehicle mass greater than 3 500 kg. The process of exchanging product data can involve — chassis manufacturer, — chassis importer, — chassis dealer, — one or more bodywork manufacturers, and — bodywork component suppliers, e.g. manufacturers of demountable bodies, cranes and loading equipment and tipping equipment. This part of ISO 21308 provides an overview and recommendations to assist the parties implementing BEP codes for their communication process. The recommendations cover different ways of communicating and presenting the BEP codes. This part of ISO 21308 also contains some examples of experience from practical use.