Monte Carlo generators

Abstract:
I discuss some recent development of Monte Carlo event generators and point out some problems. Starting with the issue of combining matrix element generators and parton shower algorithms, I will continue with discussing the problems associated with describing small-x final states and discuss some recent model developments for describing multiple partonic scatterings and underlying events in hadron collisions. Finally I will briefly present the {\sf ThePEG} project of creating a general platform in {\sf{C++}\ } for implementing Monte Carlo event generators.