A Pattern Interrupt

Do you find it difficult to maintain complete concentration of your audience on your presentation beyond, say 15mins?

Why? Because they're human and they've got things like where to go, what to have for lunch, what movies to see etc on their mind besides your presentation.

A Pattern Interrupt is a popular technique to remind your audience where they are.

To keep your audience's attention on you and your topic, interrupt their train-of-thought with a new module by creating a change.

Try introducing a new media such as vision, sound, get audience involvement in small brainstorming session or pose some questions to work their mind a little.

By interrupt the wandering thoughts of your audience and your topic will have a better chance of sinking into their consciousness.