CBR-Mining Approach to Improve Learning System Engineering in a Collaborative E-Learning Platform Topics: Decision Support Systems Algorithms, Workflows, Processes and Future Advancement; Decision Support Systems Services, Tools and Applications; Intelligent Information Retrieval, Fusion and Algorithms; Knowledge-Based Systems In Proceedings of the 3rd International Conference on Complexity, Future Information Systems and Risk COMPLEXIS - Volume 1, 94-101, 2018 , Funchal, Madeira, Portugal