Table A1.

Topic-guide of the Wave 1 focus-groups.

Issues	Questions
Feelings and needs on retirement (retirement representations)	What are your feelings about retirement in general? What are your/their hopes, needs and fears concerning health, family and the social system?
Concept: feelings and needs regarding the coaching system	3.From a technical point of view—what do you think are avatars able to do? 4.Which activities do you think can this avatar do for you? 5.Where do you see challenges with respect to the avatar? 6.What are your wishes and expectations regarding a virtual coach? 7.How could a digital health coach help you before and during retirement?
Functions and services	8.What are your preferences regarding the functions? 9.How do you want to access the coach and why? 10.What can an avatar do for your health with respect to health prevention? 11.Which features for maintaining your health would you expect?
Appearance and usage	12.If you could design your personal digital coach, how would you design it? 13.What is your first impression on ECA? What do you like/dislike and why? 14.What should be changed in order to recommend the coach to your family and friends? 15.What do you like/ dislike about the graphic solution in the system (colors, lettering, images)? 16.How often could you imagine using such a coach (once/twice a day, for five minutes or shorter/longer)? 17.How could the coach help you to cope with professional or private challenges?