Observe · Regulate · Protect — since 2007. 19th OIMAP General Assembly: Singapore, 10–12 June 2026. Programme
Arbitration

Principle of mediation

The rules, phases and ethical principles of mediation before the TAO: voluntariness, neutrality, confidentiality and agreement.

Updated : October 28, 2026· 3 min read

A four-stage process

Portrait of a Woman, Giovanni Domenico Tiepolo (1762–70)
Portrait of a Woman, Giovanni Domenico Tiepolo (1762–70)

TAO mediation follows a precise method: opening, exploration, negotiation, conclusion. The mediator guides these phases without ever imposing. The parties remain masters of the substance and free to leave at any time.

A mediation lasts on average seven weeks, over three to five sessions. It may be held in person, by videoconference or alternating the two.

This page explains the ethical principles, how it unfolds, the place of counsel and the final agreement.

  • Mediation
  • Neutrality
  • Agreement

Principle of mediation in figures

4Phases
3 to 5Sessions
7 wksAverage duration
64%Agreements reached

Source: Registry of the OIMAP Arbitral Tribunal.

Breakdown

Opening15%
Exploration30%
Negotiation40%
Conclusion15%

Time spent per phase.

The ethical principles

Mediation rests on four principles: voluntariness (no one is compelled), the neutrality and impartiality of the mediator, the confidentiality of everything said, and the self-determination of the parties, who alone decide the content of the agreement. The mediator declares any links and may be challenged.

The mediator gives no legal opinion, does not decide and reports nothing to the tribunal. The mediator helps to identify the interests behind the positions and to explore options.

Portrait of John VIII Palaoelogus, Emperor of Constantinople, 1424-1428 (reverse), Pisanello (c. 1438–1439)
Portrait of John VIII Palaoelogus, Emperor of Constantinople, 1424-1428 (reverse), Pisanello (c. 1438–1439)
The Antechamber of the Palace of Justice, Paris, Charles Meryon (1855)
The Antechamber of the Palace of Justice, Paris, Charles Meryon (1855)
The Dance at the Court of Herod, Israhel van Meckenem (c. 1500)
The Dance at the Court of Herod, Israhel van Meckenem (c. 1500)

How the sessions unfold

The opening session recalls the rules, presents the process and gathers each person's point of view. The mediator may then alternate joint sessions and separate meetings, called caucuses, during which the parties speak freely without it being repeated to the other side.

The negotiation phase explores options, assesses the risks of failure and brings positions closer. If an agreement emerges, the mediator helps to draft it precisely: amount, time limits, obligations, confidentiality clauses.

The role of counsel and experts

The parties may come accompanied by their lawyer or an expert. Counsel play a decisive role in assessing the risks and legally validating the agreement. An independent expert may be jointly called on to shed light on a technical point, for example the value of a work.

The decision-makers must be present or reachable: a mediation often fails because a party's representative lacks authority to settle.

When mediation fails

If no agreement is found, the mediator records the failure, without reasons or details, and arbitration may begin or resume. The mediator cannot be a witness or arbitrator in the case.

Even where mediation fails, the parties often say they have gained clarity about their stakes, which makes arbitration faster. A partial agreement may also narrow down the points to be decided.

Phases of mediation

Four phases
PhaseSubjectDuration
OpeningRules and framework1 session
ExplorationInterests and facts1 to 2 sessions
NegotiationOptions and concessions1 to 2 sessions
ConclusionDrafting of the agreement1 session

Milestones

  1. Request

    Acceptance of mediation.

  2. Appointment

    Mediator chosen.

  3. Opening

    First session.

  4. Negotiation

    Options.

  5. Agreement

    Signature.

Authority to settle

Portrait of a Woman, John I Smart (c. 1772)
Portrait of a Woman, John I Smart (c. 1772)
Coronation of the Virgin, Christoffel Jegher (1632–36)
Coronation of the Virgin, Christoffel Jegher (1632–36)
Sketches in Belgium and Germany, Volume I: Hall of Justice of the Magistrates du Franc, Bruges, Louis Haghe (1840)
Sketches in Belgium and Germany, Volume I: Hall of Justice of the Magistrates du Franc, Bruges, Louis Haghe (1840)

Joint session or separate session

Portrait of a Woman, Agnolo Bronzino (c. 1550)

Joint

All the parties
  • Direct dialogue
  • Transparency
  • Sometimes tense

To move forward together.

Portrait of a Man, Possibly Sir Soulden Lawrence, John I Smart (1770)

Separate

Mediator and one party
  • Frankness
  • Exploration of limits
  • Absence of the other

To unblock a situation.

Making a mediation succeed

  1. Understand

    Identify one's interests.

  2. Assess

    Quantify one's alternatives.

  3. Listen

    Understand the other side.

  4. Propose

    Formulate options.

  5. Conclude

    Draft precisely.

Practical advice

One mediator

Portrait of a Woman, Anna Claypoole Peale (1820)
« My job is to turn a dialogue of the deaf into a conversation. Often, the parties do not want the same thing as what they are claiming. »
Dr. Amélie Frontier, TAO mediator

Vocabulary of mediation

Caucus
Separate meeting with one party.
Interest
Real need behind a position.
Self-determination
Freedom of the parties to decide.
Consent award
Award recording the parties' agreement.

Frequently asked questions

Can the mediator decide?

No.

What becomes of what is said?

Nothing is usable elsewhere.

Is a lawyer needed?

No, but it is useful.

Where can I find the mediators?

Useful documents

Contacts

Small Mosque in the Kaiserbagh, Felice A. Beato (1858)
Small Mosque in the Kaiserbagh, Felice A. Beato (1858)
Registry of the Arbitral Tribunal (TAO)Paris — Head Office+33 1 00 00 04 00greffe.tao@oimap.exampleMonday to Friday, 9 a.m. – 5 p.m.

See the mediators

The Judgment of Solomon and Esther before Ahasuerus (pair), Dirk Vellert (c. 1530)

Who can accompany you.

Mediators
Image credits (16)
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