ABSTRACT
Intelligence has been an academic discipline for half a century now. Almost from the start, scholars have called for a theory of intelligence. None has been advanced. Although some authors entitle sections of their work ‘theory of intelligence’, to my knowledge no one has proposed concepts that can be tested. I propose here some principles that I believe warrant being called a theory of intelligence because they offer explanations or predictions that can be seen to be true or untrue. I believe that the facts I give validate the theory; other scholars may adduce facts that disprove it.
