This document summarizes key aspects of the sociological school of law according to Duguit and criticisms of his theory. It also summarizes the views of Justice Holmes and Roscoe Pound. Duguit's theory was based on the interdependence of people in society, known as "social solidarity." He believed law exists to safeguard this interdependence. His theory was criticized for being vague and giving judges too much power. Justice Holmes viewed law as protecting collective rather than individual interests based on experience. Roscoe Pound focused on the functional aspect of law and balancing competing interests in society to satisfy wants with minimal friction. He categorized private and public/social interests that law aims to protect.