This article is a brief survey of the contribution of perturbative studies
to our understanding of black hole physics. For natural reasons, I will not
be able to discuss all details required for an exhaustive understanding of
a field that has been active for the last forty years. Neither will I be a
ble to cover all problem areas where perturbation theory has been applied.
My aim is simply to provide the interested reader with a few pointers that
can serve as useful starting points for an odyssey through the literature.