Webster defines “collaborate” as “to work together”; it is an active verb.
In the divorce arena, the ‘Mission Statement’ of the Collaborative Law Institute of Georgia is:
“We are committed to a client centered process that focuses on the legal, emotional, and financial elements of divorce and allows couples to negotiate in an environment free from the threat of litigation.”
This process is designed to provide a forum and to create a “cooperative atmosphere and environment” in which parties can work together to resolve their disputes without the threat of court proceedings.
This process is explained well in wikipedia
“Collaborative Divorce: The Revolutionary New Way to Restructure Your Family, Resolve Legal Issues, and Move on With Your Life” by Pauline H. Tesler & Peggy Thompson