To change the driving behavior of mail-van driven so as to encourage energy saving, a program was developed and implemented in the Netherlands Postal and Telecommunications Services (FIT). Based on empirical analysis, 3 approaches were used to influence driving behavior: providing information, providing task assignment and control, and providing feedback on gasoline consumption. The effectiveness of the program was tested in a field experiment. Attitudes, social norms, and reported behavior changed, and energy savings of more than 7% were achieved, compared with a control group. From an economic point of view, further implementation in the PTT organization could be attractive.Little is known about the potential for achieving energy conservation through the use of behavioral modifications in industrial organizations. Investigations of energy conservation in

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