Book excerpt: The Dept. of Energy (DOE) handles and manages a broad spectrum of classified information, including National Security Information (NSI), which relates to national defense and foreign relations information. Federal requirements for NSI stress the need for the flow of information without compromising its protection, and prescribe a uniform system for classifying, safeguarding and declassifying NSI. The DOE's Office of Health, Safety and Security's Office of Classification manages the DOE classification program and establishes policies to conform with Federal classification requirements. This inspection report assessed the status of DOE's classified NSI program. The vast majority of DOE's classified information is Restricted Data and Formerly Restricted Data, which concerns nuclear weapons-related data. Figures. This is a print on demand report.