What Happens to a Court-Appointed Expert Report When a Dispute Moves to Arbitration?

A dispute may begin before the courts, proceed through several procedural stages, and even involve the appointment of a judicial expert. But what happens when the court subsequently determines that the dispute falls within the scope of an arbitration agreement and the matter proceeds to arbitration?

A particularly important question arises where the court-appointed expert has already issued a report, but that report is incomplete.

Can the arbitral tribunal order the same expert to complete the report? Is the tribunal bound by the findings already made? Or should a new expert be appointed?

The Scenario

Consider the following situation:

A claimant commences proceedings before a court. During those proceedings, the court appoints an expert to examine technical, financial, accounting, engineering, or other matters relevant to the dispute.

The claimant pays the required expert fees, and the expert subsequently issues a report.

However, the report is incomplete or fails to address all the matters that were expected to be examined.

The court later determines that the dispute is subject to an arbitration agreement and should therefore be resolved through arbitration.

Once the arbitral tribunal is constituted, the parties are left with an expert report produced during the earlier court proceedings.

What should the tribunal do with it?

Is the Arbitral Tribunal Bound by the Previous Expert Report?

As a general principle, an arbitral tribunal is not automatically bound by an expert report prepared during previous court proceedings.

The report may form part of the evidentiary record presented to the tribunal, but its existence does not necessarily require the tribunal to adopt the expert’s conclusions.

The tribunal must independently assess the evidence before it and determine the appropriate evidentiary weight to give the previous report.

Depending on the circumstances, the tribunal may find the report highly persuasive, partially useful, or insufficient for resolving the technical issues in dispute.

This distinction is important:

Admissibility does not necessarily mean conclusiveness.

A previous expert report may be admitted and considered without being treated as determinative of the dispute.

Can the Tribunal Order the Court-Appointed Expert to Complete the Report?

Ordinarily, the tribunal should distinguish between the expert’s previous judicial appointment and any subsequent involvement in the arbitration.

The expert originally derived his or her mandate from the court.

Once the relevant court proceedings have ended or the court has declined jurisdiction in favour of arbitration, the arbitral tribunal does not ordinarily inherit the court’s supervisory authority over that expert merely because the same dispute is now before the tribunal.

Accordingly, the tribunal would not generally treat the expert as though the original judicial mandate simply continued into the arbitration.

The fact that one of the parties previously paid the expert’s fees does not, by itself, extend the tribunal’s authority over the expert.

Can the Same Expert Be Appointed Again?

Potentially, yes.

There is an important distinction between ordering the former court-appointed expert to complete the old judicial assignment and appointing or engaging that person under a new mandate in the arbitration.

Subject to the applicable arbitration law, procedural rules, independence and impartiality requirements, and the circumstances of the case, the tribunal may consider appointing the same individual as an expert under a fresh mandate.

In that situation, however, the expert’s authority would arise from the new arbitral appointment, rather than from the earlier court appointment.

The tribunal should clearly define the expert’s new terms of reference, including the questions to be addressed, documents to be reviewed, procedural requirements, timetable and fees.

Alternatively, Should a New Expert Be Appointed?

In many cases, appointing a new independent expert may be procedurally cleaner.

This may be particularly appropriate where the previous report is materially incomplete, the scope of the arbitration differs from the issues previously referred by the court, questions have arisen concerning the methodology used, or the tribunal requires a broader or differently structured expert analysis.

A fresh appointment allows the tribunal to define the expert’s mandate specifically around the issues that are relevant to the arbitration.

It can also reduce ambiguity regarding the expert’s role and the procedural framework governing the expert evidence.

Can the Previous Report Still Be Used?

Yes. An incomplete report does not necessarily become useless merely because the dispute has moved from litigation to arbitration.

The tribunal may consider the report together with the other evidence.

For example, it may examine:

• the expert’s methodology;

• factual findings supported by contemporaneous documents;

• calculations and technical analysis;

• the documents reviewed by the expert;

• the limitations expressly identified in the report; and

• the issues that the expert did not address.

The tribunal can then determine the evidentiary weight that should be attached to those findings.

Therefore, the practical question is not simply:

“Is the previous report valid or invalid?”

A more useful question is:

“Which parts of the previous expert work remain evidentially useful, and what additional expert evidence is required for the tribunal to determine the dispute?”

Avoiding Unnecessary Duplication and Costs

Efficiency is an important consideration.

Where the parties have already incurred substantial costs obtaining expert evidence before the court, completely repeating the same work may unnecessarily increase the cost of the arbitration.

The tribunal may therefore consider whether existing work can legitimately be utilised before commissioning a completely new investigation.

Depending on the applicable procedural framework, possible approaches may include using the previous report as evidence, defining the specific gaps that require further expert analysis, appointing a new expert only for unresolved issues, or giving the former expert a fresh and clearly defined arbitral mandate where appropriate.

However, cost efficiency should not override procedural fairness or evidentiary reliability.

Saving expert costs is valuable only where the resulting process still provides the tribunal with reliable evidence and gives the parties an appropriate opportunity to address that evidence.

A Practical Approach for Arbitral Tribunals

When faced with an incomplete expert report from previous court proceedings, a tribunal may consider the issue in the following sequence:

First, determine the legal and evidentiary status of the previous report under the applicable arbitration law and procedural rules.

Second, identify precisely which issues the report adequately addresses and which remain unresolved.

Third, hear the parties’ positions regarding the report and any need for further expert evidence.

Fourth, determine whether the missing issues can efficiently be addressed through additional evidence or whether a fresh expert appointment is necessary.

Fifth, if the former expert is to participate, establish a new and clearly defined mandate appropriate to the arbitration rather than assuming that the previous judicial appointment continues automatically.

Conclusion

When a dispute moves from court proceedings to arbitration, an earlier court-appointed expert report does not ordinarily bind the arbitral tribunal.

The tribunal may consider the report and give it whatever evidentiary weight it considers appropriate under the applicable law and procedural framework.

At the same time, the tribunal does not ordinarily acquire the court’s previous authority over the judicial expert merely because the same dispute has moved to arbitration.

Where additional expert work is required, the tribunal may consider appointing a new expert or, where legally and procedurally appropriate, giving the former expert a fresh mandate within the arbitration.

The objective should be to balance evidentiary reliability, procedural fairness, efficiency and proportionality, while avoiding unnecessary duplication of expert work.