To conduct research based on an in-depth study of ten classrooms, selecting the classes with the fewest behaviour problems and then examining how teachers in those classes established a positive learning climate by interviewing teachers and students and analysing video made at the beginning of the school session, which research method should be selected?

Combining interviews with analysis of video points to a mixed methods design.

It blends qualitative accounts with more structured observational data.

Purposively choosing classes with the fewest problems shapes the qualitative side.

Correlational research only measures relationships between variables.

Experimental research manipulates conditions, which this study does not do.

Ethnography relies mainly on immersion, lacking the varied data streams here.