Sen, an economist and Professor, Oxford University, England, Theoretically discusses the meaning of Liberty and problems inherent in its definition. Side One: Introduction of Sen by Professor McLeod. Sen notes the many paradoxes within the concept of liberty and outlines the incompatibility of liberty with the pareto principle. Dr. sen challenges the adequacy of the control and power views of liberty, preferring a social choice theory. Side Two: Continuation of lecture (first 1/2) Second 1/2 Sen alswers questions from audience.