Do they deal mainly with people data things or ideas?

The question seems to be asking whether the subject in question primarily involves the handling of people, data, things, or ideas. Without specific context, it is difficult to provide a definitive answer. However, if we consider a broad range of subjects, we can say that some disciplines, such as sociology or psychology, may focus more on people, while others like computer science or statistics may deal predominantly with data. Subjects like philosophy or literature may primarily involve ideas. It ultimately depends on the specific subject being discussed.