Applied Ergonomics Group, Philips Design, P.O. BOX 218, 5600 MD Eindhoven, The Netherlands;Advanced System App. Lab., Philips, P.O. Box 80002, 5600 JB Eindhoven, The Netherlands;Applied Ergonomics Group, Philips Design, P.O. BOX 218, 5600 MD Eindhoven, The Netherlands