In inter-enterprise computing, monitoring of services have a key role in intercepting messaging not confirming to eContracts that govern the collaboration. Monitoring can thus enable privacy-preservation, prevent unfortunate transactions when a collaborating partner proves unworthy of trust, and control quality of service agreements.  In inter-enterprise collaboration environments, each party is resposible of protecting its own services and resources, and observing the fulfilment of eContract rules. Therefore, monitors can be bottlenecks in the system, unless carefully designed and placed.

The research question of this thesis focuses on the analysis of monitoring cost, utilising both calculus and practical measurements.