Table A2.

Topic-guide of the Wave 2 focus-groups.

Issues	Questions
Frequency of use of the ECA in daily life	How many times do you think you will use the virtual coach per day during the week and/or during the weekend? Do you think it would be part of daily life routines? Would you prefer to use the coach on a phone or tablet? Would you like to share your results/goals with others (partner/group/platform)?
Design and usability	5.What do you think about when you see this avatar? Is this positive or negative? Why? 6.Do you like the design? (What do you like, what do you not like?) 7.Are there any other options for avatars that you find better/more attractive? 8.Do you find the design logical to navigate through? 9.Is it clear which steps to take? 10.Do you think you will find it easy to work with this design, these buttons, etc.? 11.Do you find the design appealing?
Tasks, functions and usefulness	12.What are your first impressions when seeing the storyboard? 13.Which are your first impression about the specific tasks proposed by the ECA to the end-users as they are described in the storyboard? 14.Have you any suggestions on any potential task to be proposed to older adults like you by the ECA in the domains described (i.e., emotional well-being, physical activity and social life)? 15.Which are your impressions and suggestions about the avatar’s functionalities? 16.Do you think it is useful for people like you? 17.Which services do you think would benefit you the most? 18.Which domains will be most important to get coaching on? 19.Additional services necessary—what do you miss?
Appearance	20.Do you like its appearance? 21.What about the avatar’s age, sex and ethnicity? 22.Do you like its voice?