Professor vaugn believes that while individual theories are adequate to explain various elements of our physical, cognitive, and psychosocial development, no single theory is adequate to explain all facets of human development. professor vaugn believes in the theoretical orientation.

I believe the answer is ecletic theoretical orientation.
Ecletic theoretical orientation is a form of interactive psychological therapy that catered according to the special needs of a specific client.
Since all humans are inherently different, this orientation is more effective because it does not rely on a certain standard of treatment that's hoped to helped all types of patient.

You love them i guess