A considerable amount of information has been obtained and documented concerning the March 1979 accident, and its consequences, at the Three Mile Island Unit 2 (TMI-2) nuclear generating station. This information has usefulness beyond its immediate application at TMI-2. Issues raised as a result of the accident pose questions that are technical, legal, financial, and political in nature. These issues are far reaching and complex; consequently, the matrix organization responding to these issues may also seem complex. Because the quantity of information is vast, “technical data” generated as a result of the TMI-2 accident cleanup activities are emphasized. A summary of the most common types of information generated and the administrative entities associated with them is given.