This paper discusses the status of a government and industrially sponsored research and development program on drive train torsional vibration. Phase I of the program was completely sponsored by the U.S. Navy. During Phase I, a computer code was developed at Carnegie Mellon University for calculating the torsional response of small craft and ship drive trains. In addition, the Navy has undertaken an extensive test program to measure the torsional response of drive trains during sea trials of new and re-engined ships and craft. The resulting data base has been utilized to assess the accuracy of current torsional models and provides a basis for assessing possible improvements. Phase II of the program is being pursued through a government, university, and industrial consortium. The purpose of the Torsional Vibration Consortium is to help develop a more standard approach for modeling drive train vibration, assess and improve the accuracy of predictions, develop a readily accessible data base of component models, maintain and improve the torsional computer code, and perform basic research on various aspects of drive train vibration. The improvement in prediction capability should result in improved drive train designs that experience fewer vibration related durability problems.