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Be open, direct, and communicative with your ex. Be respectful. Do not try to interact with a violent or otherwise abusive ex.
Know that you will have to interact with each other, probably a lot. Break-ups get even more complicated when children are involved. More people’s emotions are at stake, and you cannot simply avoid your ex as you might wish to. Researchers believe that co-parenting is best for children.  Co-parenting involves sharing both time and decision-making, which requires maintaining open and frequent communication with your ex. If it is too difficult to communicate openly and directly, consider passing a notebook back and forth that includes any important information about your children’s time with you. As you make these arrangements, try to maintain amicability toward your ex.  Shouting, name-calling, and other forms of conflict can negatively affect your children and undermine their relationship with their other parent.  You: John, I know this is difficult, but I need you to tell me what time you will be picking up the kids. Him: Stop nagging. I'll pick them up after work. You: I understand that this sounds like nagging to you, but I have things I need to do tonight. Him: Fine, I'll pick them up at six. Take whatever action is required to protect yourself and your children.