Foot in the door phenomenon is a persuasion techniques that works/ relies on the size of the request being made. Experiments on this persuasion technique show that if you wish to make someone do a big favour for you, you only have to get them to do a small favour first. The above example illustrates the foot in the door phenomenon where homeowners agree to a large, ugly, unattractive installation of a sign board because they had started off agreeing to have a small one installed first.
