Which method of social research might involve shifting between participating in a social situation and being an observer?

Answer:Ethnography

Explanation:

Ethnography is a research method which is about getting to know the world from studying the social relations that exist in the world.

It studies the diversity that exist in different cultures all over the world one can do this by practical being part of that culture that they are researching about and also by observing what they do, how they do it and why the do it, so it shift between being part of that social situation and an intention to study their culture through observations.