When someone expresses support for an idea or concept, that person is more likely to then remain consistent with their prior expression of support by committing to it in a more concrete fashion. A common example undertaken in research studies uses this foot-in-the-door technique: two groups are asked to place a large, very unsightly sign in their front yard reading "Drive Carefully". The members of one group have previously been approached to put a small sign in their front window reading "Be a Safe Driver", and almost all agreed.