The requirements for hubs will be specified in the Call for Proposals. Co-location Centres are the main instrument for managing EIT KIC activities and knowledge flow at regional and local level. They bring together diverse teams from business, education and research in one specified physical location and provide the focal point for the KICs' activities in that area. Geographical proximity is essential to facilitate interactions among partners within a geographical area. In the EIT’s 2018 Call for Proposals, the applicants were requested to provide a maximum of five Co-location Centres at the proposal stage. Applicants were requested to provide concrete locations (city or town) for Co-location Centres in their proposals, ensuring that geographical proximity (clearly specifying and justifying regional coverage) and physical location principles were respected.