Consilience: Consilience is intended to serve as a measure of how much a theoryexplains, so that we can use it to tell when one theory explains more of the evidencethan another theory. Roughly, a theory is said to be consilient if it explains at leasttwo classes of facts. Then one theory is more consilient than another if it explainsmore classes of facts than the other does. Intuitively, we show one theory to be more consilient than another by pointing to a class or classes of facts which it explains butwhich the other theory does not.