In Wi, where I am a mediator, and the other mediators I know in our state, we won't touch cs- there's a guideline amount, and we proceed as if that will be the amount used. We will mediate other financial issues such as insurance or daycare costs and the like. But as far as cs goes, we don't want to risk the judge kicking back a well crafted parenting plan that the parents spent a lot of time and effort working on because they don't agree with the cs amount.