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Assistive Technology (AT) helps people with cognitive impairment (CI) in their use of computers. Studies have found that AT systems are abandoned by CI users at shockingly high rates. One of the major causes of abandonment is an eventual misalignment with: (1) user goals and abilities and (2) the functionality delivered by the system. We use data stream-mining techniques to recognize when a user seems to learn (or forget) desired behaviors that are part of a plan for cognitive rehabilitation. In our case study, CI users are given an email system to aid their cognitive rehabilitation.