"You have a number of "this is what it will cost you" options which will only work if the party you are negotiating with is reasonable. There are teams and managers out there who will happily assert that they can violate the laws of space-time in order to avoid making the sacrifices you'll tell them they need to make."
Generally speaking though, it's less a matter of reasoning with them as it is a matter of finding the right buttons to push. Is it that their goals are misaligned from yours? Phrase your response in terms of their goals; they can't be too out of line if they need something from you. Do they not trust you? Point out that they're going to have to trust you whether you do it your way or theirs.
If they're being genuinely unreasonable and out of touch with reality and they are completely unwilling to change their approach, I'd personally rather spend my time finding ways to not have to work with them. Chances are they really aren't though. They just have a different way of looking at things that you can't meet without learning to think like they do a bit.
But what if they don't trust you until you can do things that they ask ? The difficult situation is people who do not trust you and ask you to do their own way until they do - not realizing that doing it their way is exactly what prevents you from doing your job. It is fairly typical in my experience, but I have not found a way to deal with it effectively.
Generally speaking though, it's less a matter of reasoning with them as it is a matter of finding the right buttons to push. Is it that their goals are misaligned from yours? Phrase your response in terms of their goals; they can't be too out of line if they need something from you. Do they not trust you? Point out that they're going to have to trust you whether you do it your way or theirs.
If they're being genuinely unreasonable and out of touch with reality and they are completely unwilling to change their approach, I'd personally rather spend my time finding ways to not have to work with them. Chances are they really aren't though. They just have a different way of looking at things that you can't meet without learning to think like they do a bit.