After a survey paper on the principles of noise control, 10 contributed papers dealing with several areas of acoustics were presented in the session on physical principles of noise control. Radiation and propagation from sources of various kinds, analysis of vibrations, and studies of techniques for evaluating acoustic power were discussed. Of particular interest was a study of the radiation from incoherent sources, a holographic analysis of vibrations, and a paper on the visualization of the sound pressure distribution in a reverberant room [The work of U.I. is supported by the U. S. Navy Office of Naval Research.]