Use tone to ease your readers through your guideline
Imagine someone’s teaching you how to assemble a chest of drawers. It wouldn’t feel natural if they spoke like they were reading from a manual — this is why tone of voice is important.
Tone: How you change your voice to suit a purpose or mood.
Using tone with purpose
We use different tones for different purposes. Throughout a guideline, purpose changes. And you’ve guessed it — tone should too.