What constitutes Internet use in this research? Which part of the infrastructure has to be involved for it to count? Those questions don't have clear answers.

What constitutes Internet use in this research? Which part of the infrastructure has to be involved for it to count? Those questions don't have clear answers. According to Methodological Manual, they were asking questions such as “When did you last use the Internet?” during face-to-face and phone interviews. They did ask about using Internet and websites from mobile devices, in addition to “computers”. However, I'm not sure if many non-technical users would qualify updating an app (which may happen automatically), or performing various in-app activities (also may happen automatically, like updating weather forecast) as using the Internet. So it seems to be more indicative of how many Europeans, of those who do agree to phone or face-to-face interviews, deliberately access email or web sites.