Due to the ISO9001:2000 requirement for modelling business processes and the need to share business process models in Enterprise Networks, many enterprises will be looking at sharing and reusing existing enterprise models. This article identifies measures to ensure that enterprise models are interpreted as intended, thereby controlling the quality of processes using and reusing enterprise models. A pragmatic definition of model completeness is given, based on situated interpretation of meaning and theory of communication. New requirements for Enterprise Modelling Tools are also discussed.