The person who researches techniques of social influence are interested in their effectiveness and the psychological mechanisms underlying their success. It is important that a practitioner of social influence must frequently select the people he will approach with a request or a proposition. Dialogue engagement can thus be both a stand-alone social influence technique. Dialogue is a typical element of people conversations with acquaintances. The author have primarily addressed how to convince people to make a donation to a charitable cause, to complete psychological questionnaires, to attend a laboratory experiment, give blood or sign a petition to improve road traffic safety. In essence, psychologists examine social influence primarily as it relates to the possibility of convincing people to behave in ethically positive or neutral ways. The author wished to acknowledge those psychologists who go against the grain conducting incredibly time-consuming and unfashionable experiments. The sequence of low ball and foot-in-the-door proved the most effective in social influence studies.