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Early detection of mild cognitive impairment and dementia is vital as manytherapeutic interventions are particularly effective at an early stage. Aself-administered touch-based cognitive screening instrument, called DemSelf,was developed by adapting an examiner-administered paper-based instrument, theQuick Mild Cognitive Impairment (Qmci) screen. We conducted fivesemi-structured expert interviews including a think-aloud phase to evaluateusability problems. The extent to which the characteristics of the originalsubtests change by the adaption, as well as the conditions and appropriatecontext for practical application, were also in question. The participants hadexpertise in the domain of usability and human-machine interaction and/or inthe domain of dementia and neuropsychological assessment. Participantsidentified usability issues in all components of the DemSelf prototype. Forexample, confirmation of answers was not consistent across subtests. Answerswere sometimes logged directly when a button is tapped and cannot be corrected.This can lead to frustration and bias in test results, especially for peoplewith vision or motor impairments. The direct adoption of time limits from theoriginal paper-based instrument or the simultaneous verbal and textual itempresentation also caused usability problems. DemSelf is a different test thanQmci and needs to be re-validated. Visual recognition instead of a free verbalrecall is one of the main differences. Reading skill level seems to be animportant confounding variable. Participants would generally prefer if the testis conducted in a medical office rather than at a patient's home so thatsomeone is present for support and the result can be discussed directly.

DemSelf, a Mobile App for Self-Administered Touch-Based Cognitive Screening: Participatory Design With Stakeholders