Common ADR methods include:Multiple select question.arbitration.litigation.negotiation.mediation.

Common methods of Alternative Dispute Resolution (ADR) include:

1. Arbitration: This is a process where disputing parties present their case to a neutral third party (the arbitrator) who makes a decision. This decision can be binding or non-binding, depending on the terms agreed upon by the parties.

2. Negotiation: This is a dialogue between two or more people or parties, intended to reach an understanding, resolve points of difference, gain advantage in outcome of dialogue, or to produce an agreement upon courses of action.

3. Mediation: This is a method where a neutral third party (the mediator) assists the disputing parties in reaching a mutually satisfactory resolution. The mediator does not make a decision, but facilitates communication and negotiation between the parties.

Litigation is not typically considered a method of ADR as it involves a formal process in a court of law. ADR methods are usually employed to avoid litigation due to its costly and time-consuming nature.