The Collaborative lawyers, or the Mediator, will prepare a draft of the written Separation Agreement. It is a legal document with many obvious and many hidden requirements so that it becomes something that binds both parties to the legal terms within.
It is not a fill-in-the-blanks exercise! While it might start with a framework precedent, the skill comes in when it is customized to the individuals and their children and the exact terms of their settlement. Key is that it is clear, contains everything needed, and able to be interpreted in only one way.