This document is a complete update to UFC 1-300-02, establishing criteria and standards for development and preparation of UNIFIED FACILITIES GUIDE SPECIFICATIONS (UFGS). This UFC provides guidance for the preparation of Unified Facilities Guide Specifications (UFGS). The Services under the auspices of the Tri-Service Engineering Senior Executive Panel (ESEP) publish the UFGS. A definition of the ESEP is contained in MIL-STD-3007. Tri-Service committees called Discipline Working Groups (DWG) prepare the UFGS. Publication of UFGS is only by electronic media available from the distribution sources indicated in the Foreword of this UFC. UFGS are not proprietary and are available at no cost to the user.