A Marital Separation Agreement is the legal document that formalizes the decisions that both spouses agree to regarding all of details of their separation. Drafting a Marital Separation Agreement can be complicated, and the impact on your life can be dramatic. Having an experienced attorney by your side through this process is a must, since the attorney can help negotiate for the terms that you would prefer, and to draft the document in a clear, concise and legally binding fashion.