Testing was also used as a lever to change teaching methods and to tie teachers to the new national curriculum.

BBC: Signs of a turning tide on tests

"No-one in government should be contemplating standing by and watching as some schools fail in order to use it as a lever of change, " he said.

BBC: ASCL says opening free schools may be waste of money

This focused collaboration is a key lever for driving change.

WHITEHOUSE: "Doing What Works" Transcript

Chris Hall, of the Rail Accident Investigation Board, said that Mr Lund would have had "no reason to believe" the train would change direction, which was most likely caused by the driver forgetting to lock the reverse lever.

BBC: North Yorkshire Moors Railway death: Family to sue

If the lever is placed at an angle, the ring around the lens switches to digital control to change exposure-related settings quickly and easily.

ENGADGET: Olympus Stylus XZ-2 is a digital compact stuck in a mirrorless camera's body, we go hands-on