Table 1.

Semi-Structured Interview Guide

0. Opening question
0.1 What is your opinion on completing questionnaires regarding your well-being on your smartphone instead of on paper?
1. Usability
1.1 How user-friendly was the app for you?
1.2 What aspects were particularly cumbersome/problematic? What was easy and what aspects did you like about the app?
1.3 How time-consuming was using the app for you? How much time did you require every day to complete the questionnaire through the app?
1.4 How did you experience navigating through the app?
1.5 What changes/adaptations would you propose to make the app more user-friendly?
2. Suitability for daily use
2.1 Which difficulties did you experience? What did you do in case of difficulties? If support was needed: How did that influence your responses using the app?
2.2 How was it for you to respond to the questions in the presence of other people? (Why were you uncomfortable using the app in the presence of others?)
2.3 Did you think the time needed to use the app/complete the questions was too long, too short, or just right? How did it correlate with your expectations when you enrolled in this study?
2.4 How easy was it to integrate the use of the app into your daily life? And why? Please rate on a scale of 0–10 (0 is not at all easy, 10 is very easy).
3. Personal perception
3.1 Has your mood changed before/during/after using the app? If so, how?
3.2 Did the use of the app affect your mental or physical symptoms? If so, how did this manifest?
3.3 Do you think that the use of the app influenced your relationship with your caregivers? If so, how?
3.4 Did the use of the app make you feel more assured/ more secure/more confident in regards to tumor-directed therapies?
3.5 On a scale of 0–10, to which extent was the daily use of the app emotionally burdening to you? (0 not at all burdening, 10 very burdening)
4. Conclusion
4.1 What additional suggestions do you have for us?