The production and structure of jets observed in heavy-ion collisions
differs in a characteristic way from those in proton-proton collisions.
While the latter are theoretically well under controlled, jet evolution
in the presence of strongly interacting matter is presently not fully
understood. Due to the complexity of the problem and the recent
experimental progress Monte Carlo models are becoming an important
theoretical as well as experimental tool. I will discuss the theoretical
challenges and give an overview over the approaches taken by different
groups with emphasis on the JEWEL code.