This volume investigates the fundamental criteria required to define the existence and structural integrity of a legal system. Joseph Raz, a prominent legal philosopher, evaluates the nature of legal validity and the interrelations between laws within a system. By critically engaging with the works of Bentham, Austin, Kelsen, and Hart, Raz constructs a rigorous analytical framework that challenges traditional jurisprudential assumptions regarding how legal systems are identified and maintained.

Legal scholars and students of jurisprudence frequently cite this work as a foundational text for understanding the analytical structure of law. Experts highlight the density of the prose and the precision of Raz's arguments as essential reading for those engaging with contemporary legal positivism.