Usability and Sense of Presence in Virtual Worlds for Distance Education: A Case Study with Virtual Reality Experts Topics: Active Learning; Course Design and E-Learning Curriculae; Distance Education; eLearning Case Studies; e-Learning Hardware and Software; e-Learning Platforms, Portals; Immersive Learning; Instructional Design; Lifelong Learning: Continuing Professional Training & Development; Virtual and Augmented Learning Environments ; Virtual Labs and Virtual Classrooms; Vocational Training In Proceedings of the 12th International Conference on Computer Supported Education - Volume 1: CSEDU, 155-162, 2020