Three Mile Island Unit 2 data are of great interest to the scientific community, since the March 1979 accident represents the only occurrence of a transient resulting in severe fuel damage in a full-scale commercial production reactor. The data sources available for accident analyses, techniques to qualify and quantify time series measurement and sample data that have been collected and evaluated, and data base products that have been developed for use by analysts in investigating the many aspects of the accident are discussed. Applications processing features have been incorporated into the software designs to provide the end user with many useful capabilities in sorting, viewing, and analyzing the data; the data base discussions emphasize these features.