FullRecall is similar to a common flashcard program: you store in it knowledge in question-and-answer format. It later asks you these questions, you then think about the correct answer to every question. On every question, after a while, you press "show me the answer" button, and pick a grade - how well did you remember it. That grade gives it a feedback data. It also stores other data, given also current grade is able to schedule the next optimal repetition. With it you can learn new things, without worrying about repetitions of what you remember - it's FullRecall who worries about that, assuring that even if you forget something - you'll be soon reminded by FullRecall.