Most General Practitioners (GPs) in Norway use Electronic Health Record (EHR) systems to support their daily work processes. These systems were developed with basis in local needs. Electronic collaboration between the different actors has developed over time. Larger national projects like the ePrescription and the Core EHR are examples of projects that interact with the GPs EHR systems. The requirements from these projects need to be addressed by the vendors of the EHR systems. At the same time the GPs see a need for further development of their EHR systems to make them more suited as tools to support the daily work processes. This paper addresses the how GPs can influence on the design and development of their EHR systems in a situation with a preexisting installed base of systems and increasing requirements from many actors.