This part of ISO/TS 16403 specifies the test suite structure (TSS) and test purposes (TP) to evaluate the conformity of Front End and Back End to ISO/TS 17575-4. The objective of the present document is to provide a basis for conformance tests for the Front End and the Back End in Electronic Fee Collection based on autonomous on-board equipment (OBE) to enable interoperability between different equipment supplied by different manufacturers. Autonomous OBE operate without relying on dedicated road-side infrastructure by employing wide-area technologies such as Global Navigation Satellite Systems (GNSS) and Cellular Communications Networks (CN). These EFC systems are referred to by a variety of names. Besides the terms autonomous systems and GNSS/CN systems, also the terms GPS/GSM systems, and wide-area charging systems are in use. Autonomous systems use satellite positioning, often combined with additional sensor technologies such as gyroscopes, odometers, and accelerometers, to localise the vehicle and to find its position on a map containing the charged geographic objects, such as charged roads or charged areas. From the charged objects, the vehicle characteristics, the time of day and other data that are relevant for describing road use, the tariff and ultimately the road usage fee is determined. Test Purposes applicable for the Back End focus on the output produced by the Back End, i.e. Roaming Rules data element. Test Purposes related to Front End focus on the main scenarios defined in ISO/TS 17575-4 6.2.4. To verify the Front End behaviour it is needed to observe Charge Reports which are defined in ISO/TS 17575-1. The dependencies between Context Data (defined in ISO/TS 17575-3), Charge Report (defined in ISO/TS 17575-1) and Roaming (defined in ISO/TS 17575-4) to support a particular pricing scheme scenario are outside of the scope of this part of ISO/TS 16403.