Do you find yourself repeating something over and over? Funny how our kids can tune us out so easily and so consistently. My best suggestion is to stop what you’re doing and focus on the situation. I usually find that the reason I’m repeating myself is because I’m preoccupied with other things and not following through immediately when they don’t do something right away. By the time I notice that they haven't, for instance, put away the legos like I asked them to, they’re already distracted and on to something else, and then I get mad.
Of course I wish they’d just do what I ask, the first time I ask it. But I can prevent having to repeat myself so much and feeling so much frustration if I do the following: