社会心理学家做过一个著名的实验:第一步,志愿者到各家各户向家庭主妇们提出一个小要求,请她们在一份呼吁安全驾驶的请愿书上签名。研究的第二步发生在两周之后,还是原来的志愿者,重新回来找到那些家庭主妇,询问能否在她们庭院靠近公路的地方树立一块不太美观的告示牌,上面写着“谨慎驾驶”。 Social psychologists have done a well-known experiment: the first step, volunteers to all households to the housewives who made a small request, they asked a safe driving appeal petition signed. The second step in the study took place two weeks later or the original volunteer, returning to find the housewives asking if they could set up a less attractive sign in their courtyard near the road, saying “Drive cautiously ”.