of how a question is phrased to a young child.  My dh would often ask our kids if they "wanted" to do X and would be frustrated when they replied with an answer that was not desired by him.  It took awhile  for him to more thoughtful of how he phrased questions or suggestions to our kids when he knew there wasn't a real option for the kids in their response.  It was an easy "fix" in that when he didn't give an option i.e., it's time to do X, rather than do you want to do X, he found that the kids were compliant for the most part.

It's important to separate the times when kids really have a choice from when as parents we already know the outcome we will accept or the desired behavior we are looking for.  I found it simplified things tremendously for us with our kids and also made the times when they had real choices about activities, etc., much more valued and true.