Pavement rehabilitation with asphalt interlayer systems has become worldwide practice. According to EN 15381 a geosynthetic is able to fulfil one or more of the following functions: stress-relief, barrier and reinforcement. Based upon this European framework standard a number of different national guidelines has been established. Some of them have been remaining in the status of a draft for a longer period. An overview over a number of these papers is given. The guidelines/drafts are compared and analysed. A comparison of existing requirements in different countries is presented. Furthermore, a number of successful applications of non-woven products used in surface treatments as well as of multi-functional products used in pavement repair are described in the paper. These typical cases are compared and relevant parameters for a correct product selection are identified. A very simple and easy to use system approach for correct product selection is presented.