This article examines the material property data and information needs at various points in the design, manufacture, and use cycle. It contains a table that lists the various sources of materials data. The article describes the locating media for sources of data, such as suppliers of databases and internet. It discusses the specific types of sources of data, including computer readable media, data centers, and print media. The article reviews methods for evaluation and interpretation of data and discusses the processes of obtaining and reporting test data.