Back a decade ago when I was doing cyber security work we would have to generate executive summaries of our reports. The only way for this to make any sense is to imagine the audience is an ADD 3 year old. Here were some of the factors that determined an executive summary:

* Very few words, and no jargon. Every statement is a meaningful fragment, like a subtitle.

* Colors, but not too many. Think of a pie chart.

* Numbers. Executives love numbers, but be careful. The numbers have to mean something that contains very few words and no jargon.

* Keep it short, because they don't care anyway. They are just concerned that something was wrong, something was done, and finally risk was reduced. All your words and fancy colors are quickly discarded so that a quick pass reassures them emotionally.

That is exactly how I would brief a business partner today unless I have full faith they are actively involved in the health of the product. It isn't that they are stupid, but that they don't care and you cannot make them care.