Input (grade 13): After the qualifying session for the British Grand Prix Mario Theissen announced that the team had decided to halt further development KERS; of which BMW had been one of the strongest proponents, and focus instead on improving the car's aerodynamics.
Output (grade 7): After the the British Grand Prix, the team announced they would stop development KERS. They set their focus on improving the car's aerodynamics (how well the car moves through the air).