The work presented in this paper aims at contributing to enterprise interoperability. The focus is on collaboration in extended enterprises as general application field and active knowledge models as underlying technology. The starting point for the paper is an application case from automotive industry, where active knowledge models were developed for essential product development tasks. The paper concerns the development of a connector between these active knowledge models in order to support collaboration between two partners. The focus is on the operationalising phase of the connector development and on experiences. One result from this work is to propose three levels for the modeling, depending on the maturity level of the collaboration - searching for a partner, modeling existing collaboration and enhancing collaboration through detailed modeling.