black box

They often operate as “black boxes”—we can see the results but not the precise reasoning behind them.

Investigators have recovered the flight data and cockpit voice recorders -- the plane's black boxes -- which have been brought to Ankara for examination, the ministry said.

How individual firms connect to the bigger picture of aggregate productivity growth has long been something of a black box for policymakers.

Years the Food and Drug Administration required “black box” warning labels on hormone replacement therapy for women.

During the trial, jurors heard it was a matter of agreement that an analyst who studied data from the Corsa's insurance company "black box" found Mr Gray had been "the perfect driver" until the collision.