Professor Jay W. Forrester delivers the second of two lectures for the James R. Killian, Jr. Faculty Achievement Award, titled “The Common Foundation Underlying Physical and Social Systems: Applications of Systems Dynamics," on April 6, 1998. Established in 1971 as a tribute to MIT's 10th president, the Killian Award recognizes extraordinary professional accomplishment by an MIT faculty member. The winner is asked to deliver a lecture in the spring term. [T16412, T16413, T16414]