  MadGraph 5 is the new version of the MadGraph matrix element generator,
written in the Python programming language. It implements a number of new,
efficient algorithms that provide improved performance and functionality in all
aspects of the program. It features a new user interface, several new output
formats including C++ process libraries for Pythia 8, and full compatibility
with FeynRules for new physics models implementation, allowing for event
generation for any model that can be written in the form of a Lagrangian.
MadGraph 5 builds on the same philosophy as the previous versions, and its
design allows it to be used as a collaborative platform where theoretical,
phenomenological and simulation projects can be developed and then distributed
to the high-energy community. We describe the ideas and the most important
developments of the code and illustrate its capabilities through a few simple
phenomenological examples.
