Table 2.

Information about the participants and the evaluation protocol of the semi-structured focus groups performed in UK, Germany, and Greece.

	Focus group location	Protocol	Participants
Iteration I	London (UK)	1. Welcome, introduction, and obtaining participants' consent for participation 2. Demographic questionnaires 3. Demonstration of the 1st mockup of APA 4. Q&A with participants and clinical, technical, and usability experts 5. APA usability questionnaire (modified SUS) and open-ended questions	1. N = 47 2. 29 females (63%) 17 males (37%) 3. Age: 60–84 years (M = 73.61, SD = 6.12, Mdn = 72.5) 4. N = 13 (28%) had balance disorder 5. 94% use computers daily 6. Confidence in using technologies = 3.32 (SD = 0.91, Mdn = 3) 7. 60% familiar with social media
Iteration II	Freiburg (Germany) and Athens (Greece)	1. Welcome, introduction, and obtaining participants' consent for participation 2. Participants used all Holobalance modules including APA for ~15 min 3. Q&A with participants and clinical, technical, and usability experts 4. Questionnaires (Demographic, usability, etc.) and open-ended questions	1. N = 24 2. Freiburg: N= 8, Athens: N = 16 3. 21 females (63%) 3 males (12.5%) 4. Age: 60–84 years (M = 71.42, SD = 7.99, Mdn = 72) 5. N = 12 (50%) had balance disorder 6. 58.33% use computers daily 7. Confidence in using technologies = 2.33 (SD = 1.34, Mdn = 2.5)