The logic of generalized slowing theories is explored. Existing theori
es are reviewed briefly and put in a common format. The format is read
ily generalized to define a class of one-dimensional aging theories, a
tiny subset of all possible aging theories. A corresponding class of
compatible data is demonstrated, in terms of allowable configurations
of a Brinley plot. Nonconforming configurations have the force of disc
onfirming the entire class of aging theories. Information processing t
heories can be cast in a similar format. It is shown that, for a slowi
ng theory to be indisputably general, it must be associated with a mul
tidimensional information processing theory.