Τhe purpose of this deliverable is to describe all activities related to the process, design, implementation, and final release of MARVEL’s Decision-Making Toolkit. This document sets the scope and the goals of the Decision-Making Toolkit, as well as discusses the process to achieve these, the definition of the user journeys, the creation of the mock-ups, and demonstration of the use cases. More specifically, the document details the design process followed for MARVEL, the internal architecture and its features, the requirements and specifications of the Toolkit, and an extensive demonstration of all the use cases from the end user’s point of view. Finally, a detailed description of the conclusions and the contributions to MARVEL’s objectives is provided.