“进门坎效应”是指个体一旦接受了他人的较小要求以后,为避免认知上的不协调,或想给他人前后一致的印象,就有可能进而接受他人较大的要求。运用这种方法让人接受要求,叫做进门坎技术。进门坎效应首先为美国弗里德曼和弗雷瑟在1966年做的“无压力的屈从:进门坎技术”现场实验中提出来的。他们让助手分别到两个居民区去劝人在屋前竖一块写有“小心驾驶”的标牌。在第一个居民区直接提出竖牌要求,在第二个居民区先提小要求:在一份赞成安全行驶的请愿书上签字,再提大要求:竖牌。结果前一个居民区接受的人为17%,后一个居民区则为55%。研究者在分析造成这种现象的原因时认为,人们拒绝难以做到或违背其意愿的要求是很自然的;但 “Entrance barrier effect ” refers to the individual once accepted the smaller requirements of others, in order to avoid cognitive dissonance, or want to give the same consistent impression, it is possible to accept the greater requirements of others. Use this method to make people accept the request, called door technology. The threshold effect was first proposed by Friedman and Frether in the United States in 1966 for “No Stress Subjection: Entry-Gate Technology” field experiment. They asked their aide to go to two neighborhoods to persuade people to set up a placard with “Driving with Care” in front of the house. In the first residential area, put forward a request for a vertical card. In the second residential area, first make a small request: sign a petition in favor of safe driving, and then ask for more: the vertical card. The result was 17% of the population in the previous residential area and 55% in the latter residential area. In analyzing the causes of this phenomenon, the researchers believe that it is only natural that people reject the request that is hard to do or against their wishes; but