BehaviourDrivenDevelopment grew out of a thought experiment based on NeuroLinguisticProgramming techniques. The idea is that the words you use influence the way you think about something.

As an example, when I was first getting to grips with TDD, I was pairing with an experienced agile coach, writing little test methods, then writing the code, and generally feeling good about life. Then I went ahead and wrote some code without a test. The coach, JR, asked me why I'd written the code. I answered: "we'll need it in a minute", to which JR replied "yes, we might". By using the word "might", he introduced the possibility that we might not. As it turned out, we didn't. - DanNorth

A coach introducing Test-Driven Development to sceptical (i.e. most) developers invariably runs into a familiar set of objections.

From programmers:

And from testers:

This last comment is particularly ironic. In fact, the testers take on a central and very important role in Behaviour-Driven Development.

The behaviour-centric vocabulary helps us to avoid these common misunderstandings and focus on BDD as a design and delivery process.