This paper explores if and how enterprise architecture knowledge may support management of interorganizational technochange. An action research study on an eGovernment technochange project provides empirical data. Four issues of technochange are identified from the research site and presented; Solution concept communication, Stakeholder competencies, Goal ambiguity and finally the Collaborative form as such. Results indicate that enterprise architecture may support management of interorganizational e-Government technochange. In addition, collaborative competences must be developed by respective partner as new collaborative arrangements grow. These collaborative competencies could be part of a future enterprise architecture for interorganizational technochange.