This is similar to the system earlier developed by anthropologists Morton H. Fried, a conflict theorist, and Elman Service, an integration theorist, who have produced a system of classification for societies in all human cultures based on the evolution of social inequality and the role of the state.
Este sistema é similar a un anterior desenvolvido polo antropólogos Morton H. Fried, teórico do conflito, e Elman Service, teórico da integración, que estableceron un sistema de clasificación para as sociedades en todas as culturas humanas, baseado na evolución da desigualdade social e o papel do estado.