Describes a computer model developed at RAND for generating estimates of organizational and intermediate level maintenance personnel requirements for new U.S. Navy aircraft. NAVMAN provides a capability that does not currently exist for systematic estimation of personnel needs during the early stages of aircraft development (before information about subsystem-peculiar personnel factors are available in detail). The model provides (1) an analytic tool for estimation, (2) capability for assessment of estimates prepared by the military services, and (3) a means for systematic exploration of the effects of changes in certain system and maintenance policy variables on personnel requirements. This volume provides an overview of Navy personnel planning methods and of the model features (data requirements, assumptions, and reports). A companion volume, RAND/R-2402/2-PA&E contains technical appendixes.