This Guide has been written as a continuation of the efforts made during the SF-HEAT project to apply usability best practices in the design and development of the e-learning system of the project. The main idea that underlies the methodology behind the Guide is that educational effectiveness and efficiency crucially depends on the usability of the e-learning system. The Guide focuses on a simple practical approach related to a modified ADDIE model for sustainable usability improvement of the e-learning system
