Model Standards of Conduct for Mediators: AAA, ABA, ACR

The Model Standards of Conduct for Mediators, jointly published by the American Arbitration Association (AAA), the American Bar Association (ABA), and the Association for Conflict Resolution (ACR), establish the primary ethical framework governing mediator conduct across the United States. First adopted in 1994 and substantially revised in 2005, the standards define nine core obligations that apply regardless of dispute type, jurisdiction, or whether the mediator holds a law license. This page covers the structure and scope of those standards, how each operates in practice, the dispute contexts where they are most frequently tested, and the boundaries that separate binding professional obligations from aspirational guidance.

Definition and scope

The Model Standards of Conduct for Mediators originated in a joint drafting effort by the AAA, the ABA Section of Dispute Resolution, and the Society of Professionals in Dispute Resolution (SPIDR), which later merged into ACR. The 1994 version represented the first nationally coordinated attempt to codify mediator ethics across practice areas. The 2005 revision — adopted by all three organizations — expanded the standards' reach and clarified the relationship between mediator obligation and party autonomy (AAA, ABA, ACR — Model Standards of Conduct for Mediators, 2005).

The standards apply to mediators in all practice settings: commercial, family, employment, community, and court-ordered mediation. Nine standards are enumerated, each addressing a distinct dimension of mediator conduct:

1. Self-Determination — Parties retain autonomous control over both process and outcome.
2. Impartiality — The mediator acts without favoritism, bias, or prejudice toward any party.
3. Conflicts of Interest — Actual and perceived conflicts must be disclosed prior to and throughout the mediation.
4. Competence — Mediators practice only within areas of demonstrated skill and training.
5. Confidentiality — Information shared during mediation is protected subject to applicable law.
6. Quality of the Process — Sessions must be conducted in a manner that promotes fairness and preserves party dignity.
7. Advertising and Solicitation — All representations about mediator services must be truthful and non-deceptive.
8. Fees and Other Charges — Fee arrangements must be disclosed fully before mediation begins.
9. Advancement of Mediation Practice — Mediators are encouraged to support the broader development of the field.

The standards do not carry the force of statute. Their enforceability depends on whether a professional association, court program, or state licensing scheme has formally incorporated them by reference. At least 5 state court systems reference the Model Standards directly in their court-annexed mediator qualification rules, though the precise mechanism varies by jurisdiction. Mediator certification requirements by state determine how and whether violations trigger formal sanctions.

How it works

Each of the nine standards operates through a defined set of obligations and, in some cases, aspirational guidance that extends beyond the minimum floor.

Standard I (Self-Determination) is widely regarded as the foundational principle. A mediator who imposes a settlement — whether through coercion, undue pressure, or selective disclosure of information — violates the standard regardless of whether the outcome appears objectively fair. The 2005 revision clarified that a mediator may provide information and raise questions about the consequences of proposed agreements but may not direct parties toward a specific resolution.

Standard II (Impartiality) distinguishes between bias — a predisposition based on personal interest or relationship — and partiality — conduct during the session that advantages one side. Both are prohibited. A mediator who has a prior professional relationship with one party's attorney must evaluate whether that relationship creates an appearance of partiality sufficient to require disclosure under Standard III.

Standard III (Conflicts of Interest) creates a dual-disclosure obligation. Before accepting an engagement, the mediator must investigate and disclose all circumstances that could create a conflict. The obligation is ongoing: if a conflict arises mid-process, disclosure is required at that point. Unlike mediator impartiality and neutrality, which governs conduct during sessions, Standard III governs the structural relationship between mediator and parties before and outside the session room. A mediator who continues after a non-waivable conflict is identified violates this standard even if actual partiality never manifests.

Standard IV (Competence) addresses the scope of a mediator's practice. A mediator trained exclusively in family disputes who accepts a complex patent licensing case without additional preparation raises a competence concern under this standard. The standard does not require formal legal training but does require that the mediator possess sufficient process skill and subject-matter familiarity to serve the parties effectively.

Standard V (Confidentiality) operates alongside — and is partially superseded by — the Uniform Mediation Act, which 12 states and the District of Columbia have enacted in substantially similar form. Where statute and the Model Standards conflict, statute controls. The standard requires mediators to discuss confidentiality expectations with parties at the outset and to refrain from disclosing mediation communications absent a recognized exception (such as a threat of imminent harm).

Common scenarios

The standards are most frequently tested in four distinct dispute contexts.

Court-annexed commercial mediation — In programs operated by federal district courts under the Alternative Dispute Resolution Act of 1998 (28 U.S.C. § 651 et seq.), neutrals are typically required to comply with the Model Standards as a condition of panel membership. Standard III conflicts are the most commonly reported issue in this setting, particularly when mediators maintain active law practices and have prior dealings with counsel on one side.

Family mediation — Standard I presents its most acute challenges in mediation in family law cases, particularly those involving power imbalances between spouses or domestic violence history. The 2005 revision explicitly acknowledges that a mediator may terminate or suspend a session when continuation would compromise the integrity of the process — a direct response to criticism that an absolute self-determination principle could trap vulnerable parties in unsafe proceedings.

Employment and EEOC contexts — The EEOC mediation program, one of the largest federal ADR programs by volume, instructs its mediators to comply with the Model Standards. Competence under Standard IV is tested when mediators without employment law backgrounds are assigned to complex discrimination claims. Confidentiality under Standard V intersects with EEOC's own confidentiality regulations at 29 C.F.R. § 1601.26 (EEOC, 29 C.F.R. § 1601.26).

Online dispute resolution — Online mediation and ODR platforms raise questions about Standard VI (Quality of the Process). Asynchronous text-based platforms may impair a mediator's ability to detect coercion, assess party comprehension, or manage power imbalances in real time. No formal amendment to the Model Standards addresses ODR-specific obligations, leaving mediators to apply the general quality-of-process standard to digital contexts by analogy.

Decision boundaries

The Model Standards create obligations at three distinct levels, and practitioners must distinguish among them.

Mandatory obligations are identified in the text with the word "shall." Disclosure of conflicts of interest, maintenance of impartiality, and protection of confidentiality are all framed as mandatory. Violation of a mandatory provision constitutes an ethical breach cognizable by any professional body that has adopted the standards.

Aspirational guidance appears in commentary sections and uses permissive or encouraging language ("may," "should consider"). Aspirational provisions do not establish minimum conduct floors and cannot independently form the basis of a disciplinary complaint, though they may inform how mandatory standards are interpreted.

Jurisdiction-specific overlays occur when a state court rule, administrative program, or statute incorporates the Model Standards by reference but modifies specific provisions. California Rule of Court 3.857, for example, governs mediator conduct in court-connected programs and tracks the Model Standards while adding state-specific confidentiality and disclosure requirements (California Rules of Court, Rule 3.857). Where a state rule is more restrictive than the corresponding Model Standard, the state rule controls for mediators operating in that program.

The contrast between the Model Standards and state-specific codes is operationally significant. A mediator who complies with Standard III by disclosing a conflict and obtaining party consent may still be disqualified under a state court program that treats the same conflict as non-waivable. Conversely, a mediator operating outside any court program and without professional association membership may face no formal enforcement mechanism even for clear violations of mandatory provisions — illustrating the gap between the standards' ethical authority and their enforcement reach. Mediator qualifications and credentials vary substantially across programs in part because no federal statute mandates uniform adoption of these standards.

The standards do not address every ethical scenario. Conduct involving co-mediation, mediation with self-represented parties, or multiparty disputes implicates principles distributed across two or more standards simultaneously, requiring integrated analysis rather than sequential application of individual rules.

References

• American Arbitration Association, American Bar Association, Association for Conflict Resolution — Model Standards of Conduct for Mediators (2005)
• ABA Section of Dispute Resolution
• Association for Conflict Resolution (ACR)
• American Arbitration Association (AAA)
• [Uniform