The scientific objective of this work is to develop an Adaptive Technology Enhanced Learning System (TEL) able to observe, by various means, the learner's actions in order to understand his/her behaviour and to response in real time by adequate reactions taking into account people with disabilities. Indeed, in most current computer systems, the interactions between the learner and the system are usually specified by the designer in the conception process and do not take into account the history of the learner and its evolution. The approach we advocate in this work is to use Interaction Traces as Knowledge Sources that can be discovered and exploited by the system. The Interaction Traces here are defined as a history of learner's actions collected, in real time, fromhis/her interaction with a computer system.