Cooperative Studies on Laboratory Methodology

■"PHE Analytical Reference Service 1 of the Robert A. Taft SanitaryEngineering Center is a voluntary association of member organizations responsible for the conduct of laboratory programs. Its purpose is the evaluation of laboratory methods in the field of sanitary engineering. The present membership consists of 50 different agencies. A list of these is shown in Table 1> Membership, acquired by written request, imposes no obligation upon the members but is an indication of their desire to participate in the cooperative study of laboratory methodology through the analysis of specially designed samples. This mechanism provides : 1. Statistical evaluation of procedures, including precision and accuracy 2. Evidence of the need for further