The invention relates to a method of and device for service monitoring and a method of and device for service monitoring management. In particular the invention relates to a method of and device for service monitoring of at least one service, and of at least one sub-service associated with the service in which values for service monitoring metric and sub-service monitoring metrics derived from the terminal operational information are monitored and recorded. One or more service monitoring reports, containing service monitoring metric values and sub-service monitoring metric values that are relationally organised to reflect the association between the sub-service and the service, are sent. The invention also relates to a method of and device for service monitoring management in which one or more service monitoring reports, having service monitoring metric values and sub-service monitoring metric values that are relationally organised to reflect the association between the sub-service and the service, are received and stored. The received service monitoring metric values and sub-service monitoring metric values are analysed with reference to the association between the service and the sub-service to perform service monitoring management. The service monitoring of the claimed invention may be carried out in a terminal or in a proxy or agent service monitoring device.