This document discusses different theories and principles of justice. It defines justice and distinguishes between formal and material principles of justice. Material principles specify how goods should be distributed, such as equal shares, according to need, merit, effort or contribution. The document also outlines three types of justice: distributive, criminal, and rectificatory. Finally, it presents four paradigm approaches to justice: utilitarianism focuses on the greatest good for the greatest number, egalitarianism emphasizes equal distribution, libertarianism stresses individual liberty, and communitarianism derives justice from community standards.