  We review the recent developments in the theory of jet-quenching. First, we
analyze the coherent vacuum cascade and incoherent medium-induced cascade
separately. We then discuss the interplay between the two kinds of cascade and
the resulting partial decoherence of the inner jet structure. Finally, we
report on recent calculations of higher-order corrections. In particular, the
dominant radiative corrections to jet observables that yield the
renormalization of the jet-quenching parameter are addressed.
