  High P_T measurements of hard hadrons or jets at RHIC and LHC appear
contradictory and in some cases counter-intuitive, but upon closer
investigation they represent a coherent picture of jet-medium interaction
physics which can be established with systematic comparisons of models against
a large body of data. This picture is consistent with a perturbative QCD
mechanism and does not require exotic assumptions. This overview outlines how
several key measurements each partially constrain shower-medium interaction
physics and how from the sum of those the outlines of the mechanism of jet
quenching can be deduced. Most current jet results from LHC can be naturally
understood in this picture. A short summary of what can be established about
the nature of parton-medium interaction with current data is given in the end.
