It's time to talk about the psychology of persuasion.

A few years ago researchers approached house owners

and asked them to place a huge sign saying " Drive carefully " in their front gardens.

Everyone refused.

The researchers then approached a second group

and asked them to place a small " Drive carefully " sign in their gardens.

Almost everyone agreed.

Two weeks later the researchers asked those in the second group

to replace the small sign with a large one.

And an amazing 76 percent of people accepted.

Psychologists call this the " foot-in-the-door effect ".

Agreeing to a small request, makes people far more likely

to then agree to a much bigger one.

So if you want to persuade someone to do something,

start small before moving big.