Whoa--I thought my situation was difficult, but my children's father is just uninvolved, not adversarial.

I don't have any smart advice for you, but it sounds like you were on your game in that meeting. Well done!

Smart phone: we are using smart phones now, an "accommodation" in that I can text the kids reminders (one of my DC is terribly forgetful). I do think that can be a great incentive for kids at this age. Mine love electronics and are very receptive to anything in this format. A caution: this can be yet another thing to battle over with the kids. I'd think it through carefully and discuss rules and expectations with your DS so that it doesn't become a problem.