Another advantage that supports legitimacy of authority- Brickman's field experiment showed that 92% of pedestrians obeyed an order from a researcher to give a stranger money for a parking metre when the researcher was dressed as a guard. However this dropped to 49% when he was dressed in normal clothes. This experiment is more ecologically valid than milgrams as it takes place in the real world, therefore it better generalises to real life obedience, providing more valid evidence to support the importance of uniform on obedience.