Witnesses in arbitration: preparing testimony and an evidence request

Witness testimony in arbitration is useful when it clarifies a specific fact that matters to the decision. The request should therefore identify the person, the fact to be proved and the expected evidence in a way that allows the tribunal to assess relevance and scope.

Article 29 of the Vienna Rules allows the tribunal to hear parties or witnesses and to request evidence from the parties where it considers this necessary. Under section 599 of the Austrian ZPO, the tribunal decides on admissibility, conducts the evidence-taking and freely assesses the result. A witness statement is therefore part of a structured evidentiary case, not a substitute for it.

This article explains how to prepare witness evidence in Austrian arbitration. It distinguishes testimony before the tribunal from court assistance under section 602 of the Austrian ZPO and identifies the documents needed for an initial review.

What fact the witness should confirm

The request should identify a specific fact to be proved. This means an event the person can describe from personal perception, such as a meeting, instruction, handover or defined incident. The tribunal draws the legal conclusion from the established facts.

A broad statement that a witness knows the entire project history gives little guidance for evidence planning. A better description links the testimony to the date, place, people involved and source of perception. This allows the tribunal to assess whether the testimony is relevant to a disputed issue.

How to prepare the witness request

The request should include the witness’s available contact details, the specific fact to be proved and a short explanation of its significance. Add whether the person is a party, employee, contractual counterparty or independent third party. Personal knowledge should be separated from information received from others.

The request must fit the procedural stage. Article 28 of the Vienna Rules allows the tribunal, after prior notice, to admit submissions, evidence and evidence requests only up to a defined stage. Prior procedural orders and deadlines therefore matter as much as the witness’s name.

Who controls the testimony

In arbitration, the tribunal decides on admissibility, conducts the evidence-taking and freely assesses the result. This is the effect of section 599 of the Austrian ZPO. Article 29 of the Vienna Rules also allows the tribunal, where necessary, to take evidence on its own initiative, hear parties or witnesses and appoint experts.

The parties should therefore prepare questions and facts without assuming a particular assessment of the testimony. Article 30 of the Vienna Rules gives the parties an opportunity to learn about and comment on the result of evidence-taking. This includes addressing conflicts with other evidence.

When court assistance is needed

The tribunal may hear a witness itself within the scope of its procedural authority. If a judicial act is required that the tribunal is not empowered to carry out, section 602 of the Austrian ZPO may allow an application for court assistance. The request can also involve a foreign court or authority.

The application should explain the person, judicial act, fact to be proved and relevant jurisdiction. Under section 602, the tribunal or an appointed arbitrator and the parties may participate in the court evidence-taking and ask questions. The article on court assistance in arbitration addresses this route in more detail.

Compare testimony with documents and other evidence

Witness testimony rarely stands alone. Review the emails, minutes, contracts or technical records documenting the same event. Conflicts should be described precisely: do they concern timing, the content of an instruction, the people present or whether a statement was made at all?

The comparison with documents helps classify the testimony. A request for specific records from the opposing party is a separate evidence route. The article on document production in arbitration deals with that route. Selecting a witness should not turn a missing document into a general recollection exercise.

Documents to have ready for review

For an initial review, gather the arbitration agreement, main contract, relevant procedural orders, the evidence request and the opposing party’s response. Also secure the witness’s contact details, a short chronology and the documents connected to the person’s perception.

For international matters, consider the procedural language, the witness’s location and possible translations at an early stage. If recognition or enforcement abroad is also relevant, the article on the New York Convention and non-contracting states provides further orientation.

Common questions about witnesses in arbitration

Must the tribunal hear every witness named by a party?

No. Under section 599 of the Austrian ZPO, the tribunal decides on the admissibility of evidence. Article 29 of the Vienna Rules links the tribunal’s own evidence-taking and the hearing of parties or witnesses to its assessment that the step is necessary.

What matters most in a witness request?

Identify the person, a specific fact accessible through personal perception and its relevance to the disputed issue. A general statement that the witness knows the project usually does not explain why the testimony is needed.

Can a state court hear a witness in support of arbitration?

Where a judicial act is required that the tribunal cannot carry out, section 602 of the Austrian ZPO may permit court assistance. The appropriate court, evidence-taking step and procedural route require case-specific review.

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Next step

Contract, arbitration clause, correspondence and deadlines should be collected. It can then be assessed whether negotiation, preservation or arbitration is central.