This report summarises the work of WP2 on the initial plan on the selection of Use Cases, providing a key input to the design of the DEEP-HybridDataCloud testbed and laying out the DEEP-HybridDataCloud solutions will be used. This document includes a description of the Research Communities involved and of the use-cases proposed, including Data Management and Computational Intensive issues. Based on the inputs provided by the WP2 partners, an initial list of requirements for each application has been collected, that has been used in turn to assemble a list of common requirements that has been provided as input to the discussion with the technical work packages of the DEEP-HybridDataCloud project.