If the parties reach an impasse and they do not want to suffer the costs and time to litigate, another way to resolve a dispute is to submit it to an arbitrator for a binding or non-binding decision.
Lawyers, retired judges or any other agreed upon party can be an arbitrator. Each party presents their case to the arbitrator and the arbitrator makes a decision.
You can agree on the rules for the arbitration. You can present testimony, have the lawyers argue or just submit documents. You can limit the issues the arbitrator needs to decide if you can agree on other issues or you give the arbitrator brackets for a decision (such as alimony has to be between three and five years).
Arbitration is usually faster and less costly than a trial.