The Conference entitled 'Performance of Buildings--Concept and Measurement' was held at the National Bureau of Standards, Gaithersburg, Md. on September 23-25, 1968.At the present conference, papers were presented by nineteen authors representing government and industry in such diverse disciplines as architecture, engineering, science, urban planning, and standards.These papers emphasize the prime importance of considering user needs in the development of performance criteria, the necessity of test methods to determine whether the desired performance has been achieved, and the development of performance specifications and standards.Application of these ideas to building systems, and to the planning and design of entire communities, is also discussed.(Author).