  We give a brief overview of the basics and current developments of QCD-based
calculations of radiative processes in medium. We put an emphasis on the
underlying physics concepts and discuss the theoretical uncertainties
inherently associated with the fundamental parameters to be extracted from
data. An important area of development is the study of the single-gluon
emission in medium. Moreover, establishing the correct physical picture of
multi-gluon emissions is imperative for comparison with data. We will report on
progress made in both directions and discuss perspectives for the future.
