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 method or means for achieving a particular result, especially when direct or efficient; a resource.
Suitable to effect some desired end or the purpose intended.
Governed by self-interest, often short-term self-interest.
Affording short-term benefit, often at the expense of the long-term.