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 THEPEG project of creating a general platform in C++ for implementing Monte Carlo event generators.

PACS numbers: 12.38.Aw, 12.38.Bx, 13.85.Hd, 13.87.Ce