Huffington Post is addressing how to handle back to school issues with your ex:
If there's ever a time to put aside your differences with your ex, it's during back-to-school season. The start of the school year is stressful enough for kids, without their parents arguing over school fees or who's responsible for helping with an upcoming book report.
Read some readers' solutions at this link: http://www.huffingtonpost.com/2013/08/07/back-to-school-_n_3721611.html?utm_hp_ref=parenting-after-divorce 
What issues tend to cause the most disagreements between all the parents? Do you coordinate with each other, or do things on your own?