Out-Law Analysis 3 min. read

Ensuring the accuracy of witness evidence in arbitration

As 'first responders' on the scene when a dispute arises, in-house counsel have an important role to play in preserving and ensuring the accuracy of witness evidence.

A recent report by the International Chamber of Commerce (ICC) (64-page / 2.3MB PDF) makes a number of recommendations aimed at reducing biases, distortion and misinformation. These measures, which are based on scientific research into human memory, are designed to avoid what the report calls the "contamination" of a witness' memory.

A majority of the measures described in the report are designed to isolate the witness' memory from outside influences. They include meeting with likely witnesses individually; avoiding meeting with likely witnesses in groups; having only those attend the interview who are necessary to conduct it effectively; discouraging witnesses from needlessly discussing the matter among themselves; and avoiding setting out a 'party line' to prospective witnesses.

The report includes measures directed at counsel, tribunals and in-house counsel. We focus here on the measures targeting in-house counsel.

The scientific basis

The report starts by analysing existing research on memory, which concludes that human memory is "very unreliable". Hundreds of research experiments show that human memory can be altered in many ways. In particular, information encountered after an event has occurred can shape memory. As such, discussing a past event with another person, or reading about that event, can distort a person's recollection of that event.

Portrait of Florian Quintard

Florian Quintard


In the context of a construction project, measures could be put in place from the outset in order to record the context and detail of important events

The scientists involved in the ICC report, Dr Kimberley A Wade and Dr Ula Cartwright-Finch, tested the existing research in a commercial setting using an online study. The experiment confirmed that witness memory is liable to error. This was especially true when the participants were given roles as directors of one of the companies involved in the case study, or when participants were given biased internal memos on the facts of the case. The participants exposed to these biases were prone to present the facts differently when asked to recall them, and in ways that better supported their own company's case. A control group, which had not been presented with biased information and had not been given roles as company directors, recalled the facts differently, without the bias.

Contemporaneous recording of witness testimony

Recording events as they unfold will lessen the impact of memory contamination. This is the idea behind the first recommendation in the report: to establish procedures for teams to keep contemporaneous written or oral notes of issues being discussed at the time the relevant events unfold, especially in a potentially or actually contentious situation.

This measure should be considered carefully by in-house legal teams. For example, in the context of a construction project, measures could be put in place from the outset in order to record the context and detail of important events: discussions held during the negotiation of a contract amendment; agreement between the parties as to allocation of responsibility; or even setting out a chronology of facts in relation to a particular event which is likely to lead to a dispute – for example, a landslide on a road project.

From experience, gathering a witness' recollection of events can be particularly difficult. In a mega-construction arbitration, the efforts required by our team in order to compile the evidence related to a series of landslides on a linear project turned out to be challenging and costly. When witnesses were available, we often gathered conflicting accounts of the facts, while other potential witnesses had left the company and refused to participate in interviews. Ultimately, there were gaps in the story despite conducting dozens of interviews.

To avoid this, site teams could put in place measures to record important events via dated memoranda, signed by relevant team members. These memoranda could even be shared with the employer regularly, perhaps by appending them to progress reports, which would increase credibility of these documents while providing an opportunity for the employer to challenge the information provided.

We often highlight the importance of notices and of record-keeping. The contemporaneous recording of witness testimony would be a welcome addition to this practice and would allow a more efficient dispute resolution process, potentially by allowing a tribunal to rely on these records as written evidence in support for witness statements or even as an alternative to witness statements altogether – thereby reducing or even eliminating memory contamination.

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