In order to collect user requirements and ensure that the DEVELOPMENT platform will accurately "respond" to real problems of users, the DELPHI methodology is applied. This methodology is based on conducting interactive workshops with a coordinator and a group of the stakeholders involved. The process includes the use of a questionnaire and its completion by expert stakeholders through a facilitation process, to fully define the problem, discuss questions and potential solutions in three rounds of meetings. The ultimate purpose is to propose possible final approaches.