An analyser arrangement for provision of information about a facility by means of root cause analysis is disclosed. The analyser arrangement comprises storage means for storing a data model that associates with the facility. The data model provides information about possible events, hypotheses for the root causes of the possible events and symptoms for the hypotheses. Processor means for root cause analysis based on the data model are also provided. Additional information for use in root cause analysis is input into the arrangement by means of a user interface. Adaptation means are provided for modification of the data model based on said additional information.
