D6.1 uses inputs from the work done in WP 1-5. Use case definition is primarily based on the analysis of each step of the processes along the value chains, the projected links between them and their correlation to the datasets that are gathered, analyzed and saved in the data lake. WP2 (Feedstock Optimization), WP3 (Process Modelling), WP4 BBTWINS PROJECT Nº 101023334 BBTWINS Use Case Specifications/ Descriptions 6 (Blockchain), are also connected directly to D6.1 (and WP6 in general), through the representations implemented in the Digital Twin. Nevertheless, although the Digital Twin will provide a digital environment that models and simulates the outputs of WP2-5, there is also a conceptual connection between the use cases and the results produced in these WPs, especially with Tasks 1.2, 1.3, 1.4, 3.1, 3.4, and their corresponding deliverables (D1.1, D1.2, D1.3, D1.4, D3.1, D3.2 and D3.4). On the other hand, D6.1 is also linked to deliverables as input, through Tasks 5.5, 5.3, 6.2, 6.4 and 6.5 and the deliverables linked to these Tasks.