This document provides tips for writing an effective executive summary. It explains that the executive summary should sell and summarize the key points of the main document in 1-2 pages or 5-10% of the document length. The executive summary is written after completing the main document and is meant to be read independently by decision makers. It should define the scope, provide context, explain the approach, and conclude with a nutshell summary in short sentences and paragraphs that are scannable. The executive summary establishes authority and should be reviewed multiple times to reduce word count and ensure it would encourage a decision maker to read the full document.