The federal Psychology Series covers professional work on behavior. It deals with how people and animals act, what they are capable of, the traits and interests they have, and the activities they take part in.
Jobs in this series cover one kind of work or a combination of kinds. One is research. That means running experiments or observing behavior in a careful, orderly way to work out general rules about how behavior relates to a subject's surroundings, past experience, or physical makeup, or to turn those findings into practical use. Another is applied work, which means using what the field knows about theories, methods, and data to deal with real situations and problems.
Another kind is advice and instruction. People in these jobs consult with others or train them in the field's theories, methods, and techniques, so that understanding of psychology grows and the field gets used properly.