This Technical Specification specifies transactions and data for Compliance Checking – Secure Monitoring. The scope of this technical specification consists of: — The concept and involved processes for Secure Monitoring. — The definition of new transactions and data. — The use of the OBE compliance checking transaction as specified in CEN ISO/TS 12813:2009, for the purpose of Compliance Checking – Secure Monitoring. — The use of back end transactions as specified in EN ISO 12855:2012, for the purpose of Compliance Checking – Secure Monitoring. This includes definitions for the use of optional elements and reserved attributes. — A specification of technical and organisational security measures involved in Secure Monitoring, on top of measures provided for in the EFC Security Framework. — The interrelations between different options in the OBE, TSP and TC domain and their high level impacts. Outside the scope of this Technical Specification are: — Information exchange between OBE and TR. — Choices related to compliance checking policies e.g. which options are used, whether undetected/unexpected observations are applied, whether fixed, transportable and/or mobile compliance checking are deployed, locations and intensity of checking of itinerary freezing and checking of toll declaration. — Details of procedures and criteria for assessing the validity or plausibility of Itinerary Records. — Choices concerning the storage location of itinerary records, and data retention policy. — Recommendations for a single specific implementation due to different applicable privacy laws. Instead, a set of options is provided.