A theoretical construct or device with known input and output characteristics but unknown method of operation.
A flight recorder; the brightly colored cockpit voice recorders and flight data recorders in an aircraft designed to aid in determining the cause of an accident.
A device used in phreaking that prevents the calling party from being billed for the call placed.
A type of theater characterized by a lack of decoration or complex mechanisms.
Any similar device on motor vehicles, such as rail event recorders and ship trip recorders.
To focus on the inputs and outputs without worrying about the internal complexity.
A structured representation of objects to display a development plan. Road maps are used in business for strategic planning and communications.
A map with a visual representation of roads used for automobile travel and navigation. A road map may contain other relevant data, such as terrain or railway lines.
A plan of action, laying out the future actions of participants.