One of my favorite bloggers provides this  terrific and brief overview of Cialdini’s 6 classic principals of influence:

1. Reciprocity
2. Consistency (reminds me of Emerson’s “A foolish consistency is the hobgoblin of little minds”
3. Social Proof
4. Liking
5. Authority (as in being know as one)
6. Scarcity

Seems so simple and yet so few people do it well…

See on www.bakadesuyo.com