This deliverable is the first output of Task T2.2 entitled “Overall Vision and Design”. It reports the work done during the initial stage of the design of the platform (M3-M6 [November 2018 – February 2019], being the final one the period M7-M12 [March 2019 – August 2019]). The design of the CYBERWISER.eu Platform consists of an architecture based on a set of components working together to provide a cyber range platform. The components of the platform are presented, and their role explained. The interfaces between different components are described, remarking which components provide or consume them.