A network correlation engine (CE-1) to be coupled to a telecommunication network (NT) comprising at least one network section (Sm) to supply at least one event notification (Am) upon detection of an event relating to the section. The correlation engine comprises at least one event analysis block (Bn) comprising at least a root cause analysis module (RCn) to receive on input the event notification and to supply on output a root cause analysis result (RRn) and a service analysis module (SAn) to receive on input the root cause analysis result from the root cause analysis module of the block is and to supply on output a service impact analysis result (SRn).