[A user of Essential Elements of Public Speaking thought that these concepts should be discussed in the text; I had omitted them because of space limitations. So, I post these very useful concepts here.]
When you have the opportunity to persuade your audience on several occasions (rather than simply delivering one speech), two strategies will prove helpful: the foot-in-the-door and door-in-the-face techniques (Goldstein, N. J., Martin, S. J., & Cialdini, R. B. (2008). Yes! 50 scientificaly proven ways to be persuasive. NY: Free Press.)
