 1. Empirical: induction. Induction essentially involves establishing that some principle holds within the realm of our knowledge/experience (the sample cases), and then, subject to certain constraints, generalizing the principle to encompass relevant areas beyond that realm (the test cases). The attempt to establish the universality of a connection between having relevant Rs and being a product of mind on the basis of an observed consistent connection between having relevant Rs and being a product of mind within all (most) of the cases where both R was exhibited and we knew whether or not the phenomenon in question was a product of mind, would constitute an inductive generalization.