Soler, Josep, Imma Boada, Ferran Prados, Jordi Poch, and Ramon Fabregat. 2010. “A Formative Assessment Tool for Conceptual Database Design Using UML Class Diagram”. International Journal of Emerging Technologies in Learning (iJET) 5 (3):pp. 27-33. https://doi.org/10.3991/ijet.v5i3.1402.