Formats for concrete materials property data for entry into computerized databases are recommended in this guide. The guide's purpose is to facilitate efficient storage and retrieval of information about concrete and its constituents with a computer to permit comparison of data from different sources meaningfully. Intended for those who enter data and those who are responsible for planning and maintaining data into a concrete materials property database. Formats suitable for use in developing a computerized database are recommended for organizing and subdividing information about aggregates, hydraulic cements, chemical admixtures, mineral admixtures, water, fibers, and the properties, processing and performance of concrete.