Five-M Model


Mission. The mission is the purpose or central function of the system. This is the reason that all              the other elements are brought together.
Man. This is the human element of a system. If a system requires humans for operation,                          maintenance, or installation this element must be considered in the system description.
Machine. This is the hardware and software (including firmware) element of a system.
Management. Management includes the procedures, policy, and regulations involved in                           operating,maintaining, installing, and decommissioning a system.
Media. Media is the environment in which a system will be operated, maintained, and installed. This environment includes operational and ambient conditions. Operational environment means the conditions in which the mission or function is planned and executed. Operational conditions are those involving things such as air traffic density, communication congestion, workload, etc. 
Part of the operational environment could be described by the type of operation (air traffic control, air carrier, general aviation, etc.) and phase (ground taxiing, takeoff, approach, enroute, transoceanic, landing, etc.).
Ambient conditions are those involving temperature, humidity, lightning, electromagnetic effects,radiation, precipitation, vibration, etc.

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