But accidents don't just happen; they are almost always the result of human failures.

Case workers say they are overworked - one had 147 cases - but the governor's office called it "human failure."

"We had a total human failure on the part of that sergeant," he said.

It was human failure as the men inside them tired rapidly.

He spoke of a "human failure" and begged pardon in a letter to his wife.

But the depredations of nature are made worse by human failures.

The few efforts made to study these things have lost out to human failures.

It is all very well to speak of stringent controls, but you cannot guard against human failure.

Let us hope we can prevent a tremendous technological success from turning into a human failure.

All grotesquely expensive works are material evidence of human failure.