An engineer can look at the data, but he needs a translator from the cockpit - the driver - to understand it completely. For example, only the driver can tell you why he abruptly takes his foot off the gas pedal at a certain point. The data doesn't necessarily tell the engineer whether the driver made a mistake at that point or the car was acting up. The information the driver provides often helps determine the direction of development.
Michael SchumacherWith this type of thing there are always different opinions and mine is that it is impossible to blame either one of us. [on a crash with Heidfeld]
Michael Schumacher