Enterprise modelling focuses on the construction of a structured description,the so-called enterprise model, which represents (a subset of) the aspectsrelevant to the activity of an enterprise. Nowadays, knowledge engineeringprovides sophisticated methodologies and tools to support enterprise modellingand production of formal enterprise models. Recently, it has become clearer thatenterprise modelling is a collaborative activity; however, most of the modellingtechniques and tools devised so far do not consider this collaborative dimensionproperly. Therefore, we envisage the necessity to expand, extend, and generalizecurrent methodologies in order to exploit this new dimension. In this line, we proposea flexible framework for enterprise modelling that supports an agile collaborationbetween the actors involved in the modelling activities, without stickingto a pre-defined protocol of interaction. This methodology produces an integratedenterprise model model that, not only contains a structural (formal) description,but it also includes more informal and semi-formal information. We also presenta tool, based on a semantic wiki, that supports the proposed methodology.