Bureau of Labor Statistics (BLS) (collects, processes, analyzes, and disseminates data relating to employment, unemployment, and other characteristics of the labor force; prices and family expenditures; wages; other worker compensation, and industrial relations; productivity and technological change; and occupational safety and health. Most of the data are collected in surveys conducted by BLS, the Bureau of the Census (on a contract basis), or on a cooperative basis with State agencies. BLS strives to have its data satisfy a number of criteria, including relevance to current social and economic issues; timeliness in reflecting today's rapidly changing economic conditions; accuracy and consistently high statistical quality; and impartiality in both subject matter and presentation. The Bureau has no enforcement or regulatory functions. The basic data (practically all supplied voluntarily by business establishments and members of private households) are issued in monthly press releases, special publications, and in one of the following periodicals: The "Monthly Labor Review," the "Consumer Price Index," "Producer Prices and Price Indexes," "Employment and Earnings," "Current Wage Developments," "Occupational Outlook Handbook," and "Occupational Outlook Quarterly."