The European Open Science Cloud (EOSC)-Pillar National Initiatives Survey (NIS) (Bodlos et al., 2020) provides insights into the landscape of the research supporting infrastructure in the five EOSC-Pillar countries (Austria, Belgium, France, Germany, and Italy). Following the NIS dedicated to research supporting infrastructures, Work Package 3 additionally carried out qualitative interviews and a quantitative survey dedicated to user communities. This deliverable outlines three main contributions. First, we disseminated and discussed the NIS results with open science experts. Second, we conducted qualitative interviews with 14 researchers about their data reuse behavior. Third, we carried out a quantitative survey with researchers in five different countries about their data reuse behavior. Suggested Citation: Kernecker, T., Reichenbach, R., Bodlos, A., Romier, G., Mathieu, G., Vernet, M., Sanaa, Y., H¨onegger, L., Geistberger, J., van Wezel, J., Chiavarini, B. (2022). Final Report: Communities and Usage of Services. Version 1.0.