ClassDojo works as classroom management tool for teachers. Designed for an audience under 14, helps to improve specific behaviors and maintain a high level of engagement through the use of a series of technical gaming. Initially each student selects an avatar which will remain associated in time and the teacher identifies behaviors that wants to encourage or discourage that wants attributing points (or removing them) in real time. It creates a kind of ranking, constantly updated, that parents and students can check. Is also possible to introduce some individual or collective prizes.