Once again, the employer is more interested in the tools you use to effectively communicate a complex idea, rather than the idea itself. Points to bear in mind when explaining your methodology:

When communicating complex ideas, you keep your message simple and straightforward - avoiding technical jargon and overusing statistics. You don't expect people to have the same background knowledge as you and are careful to introduce your idea in clear, concise terms. You find that giving examples, using pictures and graphs helps clarify difficult concepts and can be useful as people have different learning styles. You always encourage questions and if somebody is having difficulty understanding, you are quick to adapt your style.