A theory can be anything from a vague hunch to a clear prediction. Vague or definite, it always points to things not yet known, though it must agree with all that is known. The Theory of Knowledge is a theory in precisely the above sense. It predicts that by following its rules we will gain knowledge faster and more certainly than by not following it. The theory of knowledge does not deal in absolute truths.
Ultimate reality is unknowable, by means available to science.
There is no such thing as a fact. There are, however, things we can agree on, and things we can predict. The Theory of Knowledge deals with learning efficiently, and improving our ability to predict, so that we can achieve our aims with the least possible waste of time and effort. It may suggest a theory, but is not itself a guide to action, and can not be tested. We sometimes have several different explan- ations, but the predictions they lead to are the same.