Two freeze buttons sit on the same quarry-loader console. One lets a supervisor take steering back so the shift can finish the load. The other exists only so an operator can abort a move that would endanger a walker in the pit. How should those two be classified?
Select an answer to reveal the explanation.
Short Explanation
Two freeze buttons, two jobs. The supervisor taking steering back so the shift can finish the load is user controllability under interaction capability. The abort that protects a walker in the pit is intervenability under security. Do not collapse both into one name.
Full Explanation
Discriminate by purpose and parent characteristic: controllability finishes the work under human direction; intervenability aborts a hazardous act. Treating both as one name misses that split.