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Experience sampling methods for mental health research in intellectual disability2217DesignA qualitative research design was used. Participants each tested two experience sampling applications out of three available applications for three days, with at least seven rest days in between the two testing periods. Four to five prompts (or “beeps”) were scheduled at semi-random times throughout the day (depending on the settings of the application). Prompts were scheduled between 8AM and 10PM, with at least 30 minutes between the prompts. The total sampling frequency ranged between 24 and 30 prompts. After each testing period, participants were phoned for a 15-minute debriefing interview. An additional focus group was organised with four participants.Each participant tested two applications that not only varied in design, but also in response scale. In one of the apps, Likert response scales were used, and in the other app, visual-analogue scales were used. One trained expertby-experience, who was not part of the study sample, provided advice on the protocol, study design (e.g., feasibility of the number of testing days) and clarity of the questionnaire items. We used different types of response scales to investigate the feasibility and acceptability of these scales in experience sampling questionnaires. Of the seven participants, five participants tested two apps and took part in two debriefing interviews. Because of personal circumstances, two participants tested one app and took part in one debriefing interview. Thus, in total, 12 debriefing interviews were held. Data saturation was achieved after the twelfth interview. Therefore, no additional participants were recruited.MaterialsExperience sampling method. Three existing experience sampling applications were used: Ethica (2023), m-Path (2023), and Quenza (2023). We selected three applications to explore participants’ preferences for design aspects of the applications. All applications allowed for the use of accessibility settings, such as adjusting the font size.The questionnaire consisted of twelve items from the Positive and Negative Affect Schedule for Children (PANAS-C)18,19 and four additional questions about social contact. The PANAS-C was used because of the accessible language. The PANAS-C originally consists of 20 items, which were reduced Annelieke Muller sHL.indd 221 14-11-2023 09:07