  Many sources of new physics can lead to shifts in the Standard Model
predictions for cross sections and asymmetries at the NLC below their direct
production thresholds. In this talk we discuss some of the tools that are
useful for distinguishing amongst these new physics scenarios. R-parity
violation and extensions of the Standard Model gauge structure are two typical
non-minimal realizations of supersymmetry which provide us with an important
test case to examine.
