The establishment of a collaborative data infrastructure is one of the key aspects within EUDAT. We are focussing on the community requirements and identifying common services suitable for this collaborative data infrastructure. The community data organization landscape, based on the community analysis, describes the standards and technologies used within the communities. The current state, current limitations and future wishes of the communities result in a set of common services. These common services are prioritized, described in detail in service case descriptions and used as input for the task forces in WP5.