It's the normal difference between quantitative and qualitative research. This kind of study is of the exploratory kind, capturing what's going on while the use

It's the normal difference between quantitative and qualitative research. This kind of study is of the exploratory kind, capturing what's going on while the users interact with in this case the iPad for a while. This study is very useful to use as an UX designer, to see where the potential hazards and weak spots in your design is.