"It starts with the KISS principle-keep it simple, stupid," says John Dobbs, lead cockpit designer for the F-22 Raptor Pilot Vehicle Interface. "If the pilot doesn't need to know something to complete his mission, we don't tell him." Warning lights and sounds are reduced: If a pilot shuts down the engine, he doesn't get warnings about low hydraulic pressure because the plane knows what's going on. "Sensor fusion" means that target-tracking data from the infrared, data-link, and radar systems are integrated so the pilot sees one target on the screen, not three. The Raptor combines a head-up display with a throttle and joystick that have more buttons on them than a PlayStation controller, so the pilot can fly and operate the avionics simultaneously. The Eurofighter Typhoon adds direct voice input. Craig Penrice, a Typhoon test pilot, says, "It works bloody well, like a second pair of hands."