Your audience is not dumb; they are busy.
There's a common "wisdom" that we need to dumb-down presentations to managers, but this is a hindrance to your message.
No, instead, imagine you are really busy, and you have a lot of demands on your time and, more importantly, your attention. In that mindset, what information do you need, and presented in what order, so that you can make a decision?
As technical people, we like puzzles. We like climbing over multiple steps to discover an answer. We are at times prone to structuring our presentations this way, too: Here's a neat problem, and here are all of the things I tried before finding an answer.
This is a waste of time.
Professor Tufte's argument architecture is this:
- Relevance (why it is relevant)
Your audience is smart, but busy.