Parties who engage in negotiation meet in good faith to discuss their dispute with the goal of coming to a mutually agreeable resolution. Negotiation can take place with or without a lawyer.
Attorney's Practice Guide to Negotiations by 
Getting to Yes : Negotiating Agreement without giving in by 
Lawyering with Planned Early Negotiation : How you can get Good Results for Clients and Make Money by 
Structured Negotiation : A Winning Alternative to Lawsuits by