  In light of the results from the B factories, which clearly show that the
Cabibbo-Kobayashi-Maskawa mechanism is the dominant source of the observed CP
violation in K and B physics, only small deviations due to sources of CP
violation beyond the Standard Model are likely. Therefore, in the quest for New
Physics, null tests of the Standard Model become increasingly important.
Motivated by these considerations, we describe a number of approximate null
tests of the Standard Model. These tests provide several theoretically clean
approaches to searching for new physics in the B system. We find that in many
cases, the requisite sensitivity can only be achieved with an International
Super B Factory, with luminosity around 10^36 cm^-2 s^-1.
