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1 - Matrix Element Generator
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MadGraph is one of the most widely used generator for the hard scattering computations
Standalone MadGraph can run interactively on-the-fly or by importing the predefined text scripts
Gridpacks are useful for large scale productions with consistency guaranteed
LHE level information is not physical and parton shower is needed to describe full physics
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2 - Parton Shower Generator
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Pythia8 is the main tool used for parton showering in CMS
Events are not physical if it did not go through parton shower
Jet merging is a technique to avoid double countings of jet phase spaces in ME and PS calculations
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3 - Optional (MadSpin and BSM UFO model)
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4 - CMS resources for samples and generators
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DAS can be used to find samples and their files, number of events for a certain sample etc
McM is used for sample generation management, and can be used by the user to obtain additional information about their samples, e.g. the root gridpack, fragments etc.
McM is also a good place to look for example cmsDriver commands
Different sources for x-secs exist within CMS: a CMSSW analyzer and a database
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