This part of the IEC 62264 series describes the manufacturing operations management domain (Level 3) and its activities, and the interface content and associated transactions within Level 3 and between Level 3 and Level 4. This description enables integration between the manufacturing operations and control domain (Levels 3, 2, 1) and the enterprise domain (Level 4). The interface content between Level 3 and Level 2 is only briefly discussed. The goals are to increase uniformity and consistency of interface terminology and reduce the risk, cost, and errors associated with implementing these interfaces. IEC 62264-1 can be used to reduce the effort associated with implementing new product offerings. The goal is to have enterprise systems and control systems that inter-operate and easily integrate. The scope of this part of IEC 62264 is limited to: a) a presentation of the enterprise domain and the manufacturing operations and control domain; b) the definition of three hierarchical models; a functional hierarchy model, a role-based equipment hierarchy model, and a physical asset equipment hierarchy model; c) a listing of the functions associated with the interface between manufacturing operations and control functions and enterprise functions; and d) a description of the information that is shared between manufacturing operations and control functions and enterprise functions.