Causes of service quality degradation in a communication network are determined for automated root cause analysis by identifying occurrence of degradation in service quality within a user session; identifying an underperforming resource of the communication network during occurrence of said identified degradation in service quality; in response to determining that the underperforming resource has at least one dependant resource, identifying any underperforming dependant resources during occurrence of said identified degradation in service quality; and outputting a plurality of causes of the service quality degradation including the identity of each of the identified underperforming resources.