When my 3yo DD is naughty I make her sit on said step for about one minute then I say, "Are you ready to come off now and say sorry?"
Which she does, we hug and then start afresh, until the next time and the next and the next.
My point is that the introduction of the naughty step chez nous has made no difference whatsoever to her behaviour.
Quick description of behaviour - saying "I don't like you" (to me mainly), pulling horrible faces, being defiant, cheeky, stubborn, fighting with brother physically and verbally,being contrary....basically not the lovely little girl I thought I would get.......or is this just plain and simple 3yo extreme behaviour.