Ask HN: Executive summary for early stage startup - resources?

Hi All,

I need to write an executive summary for our startup but I don't really know where to start. The audience for this summary is going to potential advisors for now and investors in the future. It is not for clients, users etc.

Any links to blog posts etc which have some ideas or examples would be greatly appreciated. If you all have some thoughts on what should/shouldn't be included, that would be wonderful as well.

Thanks