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Rule 3.900.Purposes of reference

Division 9. References · Chapter 1. Reference by Agreement of the Parties Under Code of Civil Procedure Section · Adopted 2007 · no amendments on record · Last verified July 29, 2026

In one sentenceRule 3.900 bars a court from using the section 638 reference procedure to appoint someone to conduct a mediation, keeping that adjudicative tool separate from the confidential, facilitative process of mediation.

Full Text of Rule 3.900

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A court must not use the reference procedure under Code of Civil Procedure section 638 to appoint a person to conduct a mediation.

Plain-English Summary

Rule 3.900 opens Division 9 by drawing a line between two very different roles a private, court-appointed professional can play. Section 638 lets parties stipulate to a referee who hears evidence, decides issues, and reports back to the court — an adjudicative substitute for a judge. Mediation is something else: a facilitated, confidential negotiation with no one deciding anything. This rule keeps a court from blurring the two by using the section 638 process to hand someone a mediation assignment.

That does not shut the door on every overlap between reference and mediation. A court can still appoint a referee to run a mandatory settlement conference, since that is a different function than a full reference on the merits. And someone who served as a referee in a case is free to go on and mediate that same dispute once the reference itself is finished — the restriction is on using section 638 to create a mediation appointment in the first place, not on who can later become a mediator.

Advisory Committee Comment

The following comment is published by the Judicial Council of California alongside the rule itself — not commentary from this site.

Rule 3.900 is not intended to prohibit a court from appointing a referee to conduct a mandatory settlement conference or, following the conclusion of a reference, from appointing a person who previously served as a referee to conduct a mediation.

Frequently Asked Questions

Can a court appoint a referee under section 638 to mediate a case?

No. Rule 3.900 bars using the section 638 reference procedure to appoint someone to conduct a mediation.

Can a referee run a settlement conference instead?

Yes. The restriction targets mediation appointments specifically; it does not stop a court from appointing a referee to conduct a mandatory settlement conference.

Can a former referee later mediate the same case?

Yes, once the reference has concluded, a court may appoint that same person to mediate — rule 3.900 only bars using section 638 itself to make a mediation appointment.

Amendment History

Rule 3.900 adopted effective January 1, 2007.

Source & verification. Rule text is reproduced verbatim from the Judicial Council of California. Adopted by the Judicial Council of California. Last verified July 29, 2026. · Official source
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