z Email, address, telephone, etc.: these information is used to keep correspondence with a user.
z Knowledge concepts: the interaction agent records knowledge concepts that has been visited by users in teaching processes.
z Excises and tests: the interaction agent records excises and tests that has been done by users in teaching processes, and also records users’ performance for future evaluation.
z Questions: the interaction agent records questions that has been asked by users in teaching processes, and also records users’ reaction to these questions for the evaluation of the systems’ adaption.