Page 116 - THE DUTCH TALKING TOUCH SCREEN QUESTIONNAIRE

Chapter 4
ABSTRACT
Background
In the past years a mHealth app, called the Dutch Talking Touch Screen Questionnaire (DTTSQ) was developed in The Netherlands. The aim of development was to enable Dutch physical therapy patients to autonomously complete a health related questionnaire regardless of their level of literacy and digital skills.
Objective
The aim of the current study was to evaluate the usability (defined as the effectiveness, efficiency and satisfaction) of the prototype of the DTTSQ for Dutch physical therapy patients with diverse levels of experience in using mobile technology.
Methods
The qualitative Three-Step Test-Interview method, including both think-aloud and retrospective probing techniques, was carried out to get insight into the usability of the DTTSQ. Twenty-four physical therapy patients were included. The interview data were analyzed using a thematic content analysis approach aimed at analyzing the accuracy and completeness with which participants completed the questionnaire (effectiveness), the time it took the participants to complete the questionnaire (efficiency) and the extent to which the participants were satisfied with the ease of use of the questionnaire (satisfaction). The problems encountered by the participants in this study were given a severity rating which was used to provide a rough estimate of the need for additional usability efforts.
Results
All participants within this study were very satisfied with the ease of use of the DTTSQ. Nine participants stated that the usability of the application exceeded their expectations. The group of four average/ high experienced participants encountered only one problem in total, while the eleven little experienced participants encountered an average of 2 problems per person and the nine non-experienced participants an average of 3 problems per person. Thirteen different kind of problems were found during this study. Four of these problems need to be addressed before the DTTSQ will be released because they have the potential to negatively influence future usage of the tool. The
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