There's a huge difference between spoken and written communications. Don't use the same methods for both. Over-explaining comes from lack of confidence: either

There's a huge difference between spoken and written communications. Don't use the same methods for both. Over-explaining comes from lack of confidence: either in yourself or in your estimate of the other person to understand. Talk slower, take pauses, and be more interactive. Don't rush. Provide the right amount of context. Gauge if they need more or you can shorten it. Go back and fill in if necessary. Different people listen differently. Some want the facts. Some want the story of how the facts were determined, etc. Effective communication isn't easy. Btw, the way you wrote your post is in good form for someone like me to take in. I tend to overestimate others ability to understand and speak tersely. At the same time, I'll usually always start with some context. I know some people who just start blurting thoughts out of nowhere expecting you to have read their mind for context.