Why does context in communication fail?

The most common reason context in communication fails: Believing that because something is obvious to you, it must be obvious to your reader. This is the curse of knowledge operating in real time. You will catch yourself doing it most when you are busy, stressed, or communicating with people you know well — precisely the conditions where you are most likely to assume shared context that does not exist.

The fix: Pick a message you sent in the last week — an email, Slack message, or document. Reread it as if you know nothing about the project, the conversation history, or your intent. Identify every assumption the reader would need to already hold for the message to land correctly. Rewrite it with those assumptions made explicit. Compare the two versions. The difference is the context you failed to provide.

The underlying principle is straightforward: Always give your audience the context they need to interpret your message correctly.