Thats why the military became so interested in systems analysis in the late 50's and 60's. One method to analyze and develop a counter System to any Violent System out there. State,Non-State,4GW, Guerrilla,Insurgents,Terrorist,Gangs,and criminals.

Here is a link to an excellant paper on the subject, read it and look at how many differant groups it applies to. Simple is good
http://www.usafa.af.mil/df/inss/OCP/OCP52.pdf