When you make a request, do not phrase it in the form of a question--asking gives the impression that it is a choice to follow your instruction or not.
Unless it is really a choice, do not add "ok?" after you make a request.
Eye contact and physical contact (like a gentle touch on the shoulder) makes the child feel that your guidance is in their best interest.
After you make a request or a reminder, walk away. Do not hover.
Give the child a chance to comply.
Remove emotion, be matter of fact.
