My Theory of Seven says that anytime you have to communicate with a large group of people, you should do so as though everyone is seven years old. This doesn’t mean talking down to people; it means being so interesting, clear and simple that you hold their attention.
The Theory of Seven works in marketing, selling, speaking, education, and management.
We’ve all suffered through the speaker who drones on and on for an hour, assuming that adults have an infinite ability to pay attention. In reality, you probably started daydreaming before the guy finished thanking his host, colleagues, mentors, former teachers and long-lost relatives.