
When looking at what type of interviews would be suitable for my action research project I found the chapter “Interviews” (pp. 409-443) of this book helpful and it gave me a lot to reflect on.
There is a good collection of key terms which determine quantitative vs. qualitative approaches:

And it follows on to describe:

This makes sense to me and very much describes, what I had intuitively assumed before conducting the first action research intervention and short interview with my students last week, in order to investigate my research question. I went for the qualitative type of interview approach, semi-structured, as this is more suitable for the personal and subjective data I am gathering for this particular research question.
Additionally these key characteristics of qualitative research interviews are very valuable to my own interview design:

Reference:
Cohen, L.; Morrison, K.; Manion, L.; Bell, R. (2011) Research methods in education. London: Routledge.