Compliance is known to be enhanced by a number of situational manipulations such as foot-in-the-door, door-in-the-face, low-ball and ingratiation.
A number of studies have compared the effect of different compliance techniques, for examples,
Low ball technique was generally the most effective, especially with respect to the amount of money contributed. This was followed in turn by the door-in-the-face and control conditions, with the foot-in-the-door condition the least effective in virtually every comparison. (Briwnsten, Katzev, 1985)
Therefore, analysis of different tactics in different studies suggests that success of applications may depend on carefully planned modifications of the techniques to calibrate them optimally to the particular situations in which strategies are to be undertaken
Grace, C.R., Bell, P.A., Sugar, J. (2001) “Effects of Compliance Techniques on Spontaneous and Asked-for Helping”, The Journal of Social Psychology, 128, 4.
Wevant, J.M. (1996)”Application of Compliance Techniques to Direct-Mail Requests for Charitable Donations”, Psychology & Marketing,13,2.