Table 1 Semi-structured interview: issues covered

Motivations to participate in the study

Advantages/disadvantages of online training and support

• Advantages, if any, of getting online training and support

• Advantages/disadvantages of online interventions as compared to face-to-face

Perceived results of iSupport

• Perceived positive or negative results of iSupport

• Perceived persistence of positive results (if any) over time

• (If positive results are not perceived) features that the program should have to produce positive results

Usage of iSupport

• Continuation/discontinuation of use

• Motives to keep using the program/to have discontinued

• Satisfaction with the frequency of using iSupport

• Obstacles to use/a more frequent use of iSupport

• Description of program usage

- Choosing lessons

- Timing/schedule and place

- Devices

Satisfaction with contents, design, and functionalities

• Satisfaction with:

- Interface appearance and easiness of use

- Themes

- Language

- Content presentation

- Self-guidance

• Missing features

Program endorsement and user profile

• Willingness to recommend iSupport to other carers

• Beliefs on iSupport usefulness for other carers

• Perceived profile of carers who would use iSupport

Concomitant use of psychosocial services

• Use of psychosocial interventions during the study

• Perceived positive/negative results of such interventions

• (if not used) Reasons for not having used other services

COVID-19 pandemic

• Influence (if any) of the pandemic on using iSupport

• Loss/suspension of other psychosocial supports

• Motivation to keep using iSupport after recovering other forms of support (if applicable)

Study procedures, inconvenience, or harm

• Perceived inconvenient or arms (of the intervention and study procedures, including reasons for not filling out all assessment waves)

• Influence (if any) of weekly reminders on program usage