The purpose of this project was to develop and evaluate in-shelter guidance materials which any fallout shelter manager, trained or untrained, could use as an operational management guide. An initial version of the Shelter Managers Guide was used by both trained managers and emergent leaders in 24- and 48-hour habitability studies conducted by the American Institutes for Research. After the Shelter Managers Guide was revised, it was evaluated in an experimental comparison with other types of guidance materials. The final product is arranged by priority of management decisions and actions within five shelter phases: Entry, Initial Organization and Operations, Routine, Temporary Emergence, and Contingensies (emergecies). It provides the management decision and actions necessary to organize and operate a fallout shelter, and supplies the information which the manager needs to support these decisions and actions.