A system (200) comprises a plurality of data collectors (210), a correlator (220), a context analyser (230), a baseline analyser (250), a database (260), and a graphical user interface (GUI) (270). The data collectors (210) are deployed on the services or applications that they monitor, or on the network between these applications as a network appliance, and are designed to capture messages that are passed between the various services. The data collectors (210) are non-intrusive, i.e. they do not to impact the behavior of the monitored services. The data collectors (210) can capture messages transmitted using communication protocols including, but not limited to, SOAP, XML, HTTP, JMS, MSMQ, and the like.