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Just war is a specific concept of how warfare might be justified, typically in accordance with a particular situation, or scenario, and expanded or supported by reference to doctrine, tradition, or historical commentary. The tradition began in the ancient Greek society, and was later developed by a number of Christian theologians. The just war tradition includes a great variety of thinkers who advocate different ways of employing shared concepts (just cause, good intentions, proportionality, discrimination, etc.) for purposes of ethical reflection and judgment about the use of force, and the tradition has been expanded to include non-traditional forms of warfare, such as guerrilla war and humanitarian interventions.