Table 6.

Results from the process evaluation interviews on the main themes “theory of change” and “context.”

Theme	Subtheme	Quote
Theory of change	No support	Interviewer: “Did the chatbot help you with anything?” Adolescent: “No, it didn't.” (Boy 1, grade 9, vocational track)
	Social support	“Um, that he can encourage you more to do something” (Girl 2, grade 9, general academic track)
	Instrumental support	“So I asked uhm, yes how did I ask it, ‘can you help me move more' and then he answered with a site and a text with more information… yes you can find all kinds of things because of the chatbot.” (Boy 2, grade 9, general academic track)
	Emotional support	“Um (…) the chatbot helped me the most because I was in a whole emo-dip last week and I had asked 'what should I do with that?' Then he answered 'maybe you should watch some happy videos' and I thought okay, maybe I should do that sometime. I tried that and it helped sort of, a little bit.” (Girl 1, grade 9, vocational track)
	Support with the app	“If there are uncertainties about, for example, the secret agents [i.e., part of the app], you might really ask the chatbot 'what is the intention?' So maybe that's very useful.” (Girl 4, grade 9, vocational track)
Context	After school	“I used the chatbot after school, at 4-5pm.” (Boy 5, grade 8, general academic track)