This working guide on the principles and techniques of controlling acoustical environment is discussed in the light of human, environmental and building needs. The nature of sound and its variables are defined. The acoustical environment and its many materials, spaces and functional requirements are described, with specific methods for planning, designing and reorganizing facilities. Building and mechanical equipment sound control is reviewed in conjunction with--(1) sound transmission, (2) sound barriers, (3) sound control, (4) sound reinforcement, and (5) sound absorption. Performance criteria are also cited, along with the legal, medical, and trouble-shooting aspects of the sound environment. Tables, charts, drawings, check lists and a bibliography are included. (TG)