If is often argued that SDI implementation requires coordination, because without coordination all other SDI components would not be developed or would be developed in a very fragmented and inconsistent manner. In general terms, coordination is about bringing into alignment the activities of different stakeholders in the SDI landscape. A typical instrument to realize coordinate in the context of SDI, is the establishment of an effective SDI coordination structure. The SDI coordination structure should ensure that all stakeholders are involved in the development and implementation of the SDI, through the participation in one or more coordination bodies. Another important element is the establishment of clear roles and responsibilities for the different involved organizations, making a distinction between data users, data providers, services providers and a geo-broker.