If you interview a group, do not make the mistake of thinking you are efficiently interviewing many individuals at once.

If you are interviewing a group you are interviewing a group. So make sure that the group you are interviewing represents a group who will be acting together in real life in whatever situation you are trying to learn about. Otherwise, you will interview the wrong group, even if it is made up of fragments of the right groups.

By the same principle, if you interview individual constituents of a group, do not make the mistake of thinking you will understand the group once you’ve interviewed each and every member. If you want to understand how a group thinks, you must interview the group.

(Obviously, I’m again using Buber’s distinction between social and interhuman.)