ADA is an Open Source software that allows you to create, administer and follow courses via the Internet or intranet with ease, flexibility and customization.  With ADA, learners have more than a simple list of the documents or video lessons to download but they get a real collaborative learning environment that enables students, independently or divided into groups, to browse content, interactive hypermedia and interact with tutor and other students with internal messaging  tools (instant messages, chat and videoconferencing).    We have also devoted great attention to student evaluation process. The authors can create dozens of different types of exercises (quizzes and questionnaires) and also use task analysis tools to make evaluations not only on the results of the quiz but also on the conduct of exercises or relational capabilities of the class.