D3.3 Digital Twin platform implementation, services and usability

This deliverable explains principles of the Digital Twin platformimplementation, its services and how usability has been considered.First, it is clarified how the implementation of digital twin platform hasbeen performed. Then, the services developed under WP3 areintroduced and explained, concluding in a list of SPHERE Services frompartners explaining also briefly how their integration to the SPHEREecosystem is carried out. Finally, we explain how qualities of usabilityhave been addressed as inter-project practice, following three-levelprocess including heuristic evaluation, trial testing and actual testing.