Strategic guide to concurrent evidence in Australia



Behind the 'Conclave' from an Expert's perspective

For litigators managing expert witnesses, the 'conclave' and 'hot-tubbing' can be a highly unpredictable phase of the litigation process. A well-managed expert witness in this process is a strategic asset that forces favourable settlements and wins bench decisions. A poorly prepared one becomes a material liability. Drawing from over two decades of experience, here is what every litigator and expert witness needs to know about concurrent evidence from an expert's perspective.

Understanding the battlefield: Primer on Concurrent Evidence

Concurrent evidence is a distinct feature of the Australian civil litigation system, which encapsulates:

  1. Conferencing between the expert witnesses instructed by adversarial parties, sometimes referred to as the 'experts' conclave' (although the terms conference and conclave can have subtle differences as explained below);
  2. Preparation of a written report by those expert witnesses, being the expected outcome of the experts' conference or conclave; and
  3. Tendering of oral evidence, by those same expert witnesses, during the same court session (colloquially referred to as 'hot-tubbing'). 


The reality of hot-tubbing

Hot-tubbing is a loaded term.  More helpfully, the website of the Judicial Commission of NSW contains instructional videos in relation to the provision of concurrent evidence during a final hearing (i.e hot-tubbing), made in or around 2005 featuring a land resumption case in which the expert witnesses were involved, in what seems to be an open conversation between each other and the judge, after the barrister asked a question. My own experience of being in a ‘hot-tub’ has varied considerably across courts, ranging from being invited by ‘my counsel’ to provide the court with an opening statement about my evidence before being questioned by the judge and barristers organaised by topic area, to a very tightly controlled process by the barristers, akin to a more traditional adversarial process, in which each barrister take turns to question the expert witness instructed by the other side on a serious of topics, with little opportunity for the other expert to speak unless the judge intervenes to ask a question.  The presiding judge will therefore influence the tendering of oral evidence from the witnesses appearing concurrently.


Case management involving concurrent evidence

Case management across the superior courts of Australia varies between courts and is often case-specific.  While the application of concurrent evidence features in many litigated matters across Australia, it is not necessarily the default system across the superior courts of Australia.


The Honourable Justice Lee of the Federal Court of Australia has authored the Joint Expert Conclave Protocol for this.   This protocol includes, amongst other things, two somewhat unique features relating to the management of the conference of expert witnesses, being

  1. use of a 'Facilitator', typically an independent barrister, who manages the experts during the conference to assist them in preparing a useful joint report for the Court; and
  2. supply to the expert witnesses about to conclave, a pre-agreed set of questions to answer in a jointly prepared report.    Typically, for forensic accounting and valuation-related expert witness engagements, the expert witnesses are opining on matters concerning quantum, so it is less common for instructing solicitors on adversarial sides to consider and agree on a set of questions for the expert witnesses to answer.  In this type of expert witness scenario, it is understood that the expert witnesses will be assisting the court by providing their respective reasoning on the quantum of loss or value.  However, that is not to say there should be no communication between instructing solicitor and expert witness, before the commencement of the experts' conference/experts' conclave to address other potentially relevant questions for expert witnesses to answer that could assist the court. 


Courts across Australia are harmonised, meaning there is a process of making different systems, rules, or practices consistent or compatible with each other in an effort to achieve uniformity across different legal jurisdictions.  However, the process and language adopted are not uniform across all the superior courts of Australia.  In Western Australia, the terms 'expert conference' and 'expert conclave' are set out in practice direction 4.5.2 Expert Evidence of the Consolidated Practice Directions updated by the Supreme Court of Western Australia in May 2024, are distinct to make explicit that the Registrar of the Court is involved in the latter, akin to Justice Lee's FCA Joint Experts Concalve Protocol featuring the use of a Facilitator.   


Navigating the unfacilitated conference of expert witnesses

In preparing the primary report for court, containing one's opinion evidence, the key steps are:

  1. identify what you need and how to get it;
  2. analyse what you get, make further enquiries as appropriate; and
  3. proceed to write and finish your report, furnishing the opinion which you are qualified to provide with sufficient reasoning.

Sure, there can be challenges for the expert witness along the way within each of the above steps, but he or she can guide others and take control of how the report is prepared for the court with the assistance of lawyers. Assuming one has to appear in court to be cross-examined, one is thoroughly prepared to answer questions in discharging one's paramount duty to assist the court. 


In contrast to preparing one's expert witness report and appearing in court to give oral testimony, the unfacilitated 'experts' conference' culminating in the joint experts' report can be a unique hurdle to jump over!


When it comes to the preparation of a joint expert report, seasoned litigators and expert witnesses are acutely aware that the courts' code of conduct for expert witnesses requires that the joint experts' report set out matters of agreement and disagreement, including the reasons for disagreement.  Unfortunately, the unfacilitated experts' conference can be relatively more painful than it needs to be if:


  • you (as an expert witness) have not previously done this exercise of conferencing with another expert witness, sans direction from the instructing solicitors, and not had prepared a joint experts' report;


  • the other expert witness is not a professional (full-time) expert witness; and/or


  • the other expert witness is less concerned about discharging the paramount duty to assist the court, and more concerned with maintaining a position in fear of what the lawyers or clients might think if there is a retreat from a previously expressed position.


The above manifests in different ways, and the other expert witness(es) instructed by the opposing lawyer can make the unfacilitated experts' conference process more stressful than it ought to be.


Over the past decade, I have been called to enter into many unfacilitated conferences with other expert witnesses on different occasions throughout the course of any year.  The following is a litigator's checklist to help ensure your expert witness is ready for the conference with the adversarial party's expert witness, assuming the conference will not be facilitated by an independent person.


Litigator's checklist before the unfacilitated conference of experts


  1. Mandate early engagement.  Don't wait for a court order.  Proactively talk with your expert witness and get the expert's views on when this process should be started, as often there may be meritorious reasons to start sooner rather than later.  This also obviously requires engagement with the adversarial parties' legal representative.  Early engagement narrows issues sooner, reducing costs and creating powerful settlement leverage.
  2. Secure the experts' bandwidth.  The expert witnesses should give themselves the capacity to fully engage in the process of conducting the conference, without distraction. This would include making sure your expert witness has delegated unrelated work to others, to have the capacity to do their best work during the conference.
  3. Coach the desired outcome.  Assume the matter could proceed to a final hearing, and if this happens, the joint experts' report needs to be a useful document to assist the court and to present your expert witness' opinion as the opinion which should be preferred by the judge.  In relation to assisting your expert witness in preparing a useful document, share your preference on the style of the joint report that would assist the court, especially if there is agreement with the adversarial parties' legal representative as to style. There are two polar distinct template styles which are common being: a) a 'Scott Schedule' where a table is prepared with the issue of the left of the table and each expert's response to the right of the identified issue, or b) sequential paragraph numbering where one expert drafts what he or she wishes to write for a particular topic, followed by the other expert writing what he or she wishes to write on that same topic. Some expert witnesses may be inflexible on style, in the absence of any prior direction, which may result in suboptimal joint expert reports.  A Scott's Schedule style of joint report typically works best when there is a pre-agreed set of questions to be answered (which would and should involve the expert witness' input in formulating the questions prior to the conference commencing).
  4. Eradicate advocacy from your expert witness. An expert who appears as a partisan advocate destroys their credibility—and by extension, yours—in the eyes of the judge. Remind your expert that emotional language is a sign of a weak argument.  In interacting with your expert witness, get insight on whether he/she might allow emotions to creep in during an expert witness conference, including saying and writing things that make the expert witness look unprofessional. The other expert is unlikely going to point out drafting by your expert witness makes him or her look like an advocate.  Suggest to your expert witness to find the right words when drafting a joint experts' report to open the door for the other expert to gracefully retreat from what at first seems like an issue of disagreement and ultimately an unpreferred opinion.
  5. Insist on transparent communication on timing.  While the expert witnesses should be free to agree to disagree on matters of opinion, and not seek instructions from instructing solicitors, during the experts' conference.  The lack of regular communications between the expert witness and the instructing solicitor during a conference of expert witnesses does not mean there should be complete radio silence between lawyers and witnesses.  Insist that your expert witness should agree with the other expert witness on a proposed realistic due date (if a due date has not been set by the court) and communicate this date to the instructing parties, and if it subsequently becomes obvious to the expert witnesses that the due date will not be achieved, communicate this to the instructing parties with a revised date for completion.  Remind your expert witness that the parties may want to settle the matter before a judge decides the outcome, and submitting a long and detailed joint report that does not give both parties sufficient time to consider its contents before a final hearing has started makes it more difficult for the parties involved in litigation to consider settling the matter.
  6. Have an escalation plan involving uncooperative experts.  If the other expert is obstructive, your expert witness' documented efforts to collaborate with the other expert witness may become powerful ammunition to petition the court for a facilitated conclave, reframing the problem as a procedural necessity to assist the court. To avoid reaching this point, always encourage your expert witness to seek to narrow the issues in dispute with the other expert by suggesting the court is likely to view both expert witnesses favourably if a joint report can identify as many areas of agreement as possible, particularly where there are significant issues of disagreement.  Where the expert witnesses are opining on matters of quantum, this may involve explicitly alerting your expert witness to be prepared to accept the other side's assumptions, even though they are rigorously disputed by your side, in order for your expert witness to appear impartial and be of assistance to the court.   
  7. Encourage your expert to be pithy.  Brevity in a joint experts' report should not be achieved at the sacrifice of providing sufficient reasoning for an opinion by an expert.  For opinions based on forensic accounting and/or valuation expertise, the matter of disagreement boils down to matters of quantum.  If this is the case, remind your expert to always consider what is drafted in a joint experts' report in the context of its relevance to quantum in dispute. As you would know, the judge is not required to make a finding on which expert witness is technically correct on an esoteric point, so encourage your expert witness to focus on the reasoning for disagreement on an issue which is materially significant to the court in terms of deciding on matters of quantum. 


The process of concurrent evidence, when navigated skillfully by litigators and its retained expert witness(es), can transform procedure into a decisive advantage. Concurrent evidence provides a clear, side-by-side comparison for the judge and often reveals the core strengths and weaknesses of each party's position. A successful conference of expert witnesses isn't about winning a debate with the other expert; it's about winning the trust of the judge, assuming the matter proceeds to a final judgment.  It transforms your expert from a mere witness into a decisive strategic asset.


Author:

FOUNDER OF ACUITY FORENSIC

Leave a Comment:

SEARCH ARTICLE:

SHARE POST:

RECENT ARTICLE:

Navigating Legal Professional Privilege as a Forensic Accountant
By Adam Giliberti June 23, 2025
Being served with a subpoena to produce documents can be distracting. I delve into legal professional privilege from the expert witness perspective.
By Adam Giliberti February 13, 2025
Claims for compensation under s1317H of the Act in court proceedings involving shareholder disputes should be carefully considered by a forensic accountant called on as an expert witness.
Top 20 Brands in 2024 per Brand Finance, leading international brand and strategy consultancy
By Adam Giliberti June 8, 2024
A relief from royalty method is an elegant and widely used valuation method to value Brand. This method is ideal for valuing brands supporting products and businesses which are established. Download our technical guide to receive insight in how we value Brand.
What is True Value? HCA considers it in misleading & deceptive conduct
By Adam Giliberti February 29, 2024
What is True Value? The High Court of Australia provides guidance and considers it in the context of misleading and deceptive conduct litigation.
Tax Gross-Up on Claims for Damages & Compensation
By Adam Giliberti November 14, 2023
What is a tax-gross up? What is the justification for it in damages or compensation? The danger for forensic accountants in making assumptions on tax with little knowledge of tax law and compulsory acquisition lesson learned.
By Adam Giliberti August 7, 2023
This article addresses the valuation of a non-controlling (minority) ownership interest in a privately owned company (or trust) and the commonly applied valuation discounts when considering the 'market value' of such interests.
By Adam Giliberti June 11, 2023
Attacking the messenger and the message! The practice of preparing valuation reports is well established in Australia. Despite the prevalence of numbers and calculations in a valuation report, valuation practitioners come from a variety of different backgrounds, which are not limited to those with an accounting and/or finance background. This has led to a haphazard and ad-hoc approach to setting quality standards across the body of valuation work in Australia. Attacking the messenger… From July 2008, members of Australia’s two largest accounting professions – the Institute of Chartered Accountants in Australia and CPA Australia – are required to adhere to APES 225: Valuation Services (“APES 225”). This sets out mandatory professional obligations on those providing a valuation service and has helped lift the quality of valuation reports. However, valuers who are not members of the accounting professions in Australia do not have to comply with APES 225. Up until 2014, there was no professional body in Australia that formally recognised practitioners who prepared valuation reports on businesses, part interest in businesses or legal entities, intangible assets and intellectual property rights. In late 2013, the Institute of Chartered Accountants in Australia, merged with its counterpart in New Zealand (to form Chartered Accountants Australia and New Zealand) started a process of inviting its members who practiced in providing valuation services to become formally accredited as Business Valuation Specialists. This process required members to demonstrate a requisite number of years practical experience in addition to rigorous formal education. Those members which met the assessment criteria set by the Institute of Chartered Accountants are now are called ‘CA Business Valuation Specialist’. The concept of accredited specialists is not new to the legal profession. The benefits for lawyers and their clients, where lawyers are promoted as having formal accreditation in a particular area of law are apparent. It is hoped that the promotion of CA Business Valuation Specialists will also benefit lawyers and their clients as it will provide additional comfort that the quality of valuation reports prepared for dispute purposes will be fit for its purpose. Attacking the message… Unfortunately, there are still numerous business valuation reports prepared for dispute resolution purposes that are not fit for purpose. Here are the top 7 common problems we have encountered with business valuation reports: 1. Inappropriate ‘standard of value’ adopted in a valuation report. There are subtle but important legal differences between concepts such as ‘fair market value’, ‘fair value’ and ‘value to owner’ to name just a few different types of standard of value. This potentially means the value opinion could be materially different depending on the appropriate standard of value to be adopted. For example, in family law and compulsory acquisitions matters, ‘value to owner’ principles prevail. In shareholder/owner disputes, ‘fair value’ principles may be the relevant standard of value to adopt. Commonly, business valuations are prepared with ‘market value’ or ‘fair market value’ definitions – it is therefore not surprising that some business valuers struggle with the nuances and practical application of a different standards of value. There are numerous examples of courts rendering valuation reports as inappropriate purely on the basis that the wrong standard of value has been adopted. 2. Confusion between what is actually being valued in a business valuation report. The following concepts have very different meanings and therefore the value attached to each can be significant: ‘company’ or ‘entity’ value (where a legal entity other than a company is being valued; ‘business’ or ‘enterprise value’; ‘share’ or ‘equity value’ (where a part interest in a legal entity other than a company is being valued); and A parcel of shares or investor value. We have seen valuation reports which use all of the above terms inter-changeably which leads to confusion as to what is actually being valued. Lawyers instructing business valuers are not expected to know what precise term should be used in an instruction letter, however it is incumbent on the business valuer to clarify exactly what is being valued and provide a clear definition of this so as to not mislead readers of a valuation report. 3. Mismatch between the discount or capitalisation rate and earnings base. The following are different types of earnings bases: Earnings Before Interest Tax Depreciation and Amortisation (“EBITDA”); Earnings Before Interest Tax (“EBIT”); Net Profit Before Tax (“NPBT”); Net Profit After Tax (“NPAT”); Net Cash Flows before Interest; and Net Cash Flows after Interest. It is inappropriate, for example, to observe a published EBITDA multiple for a comparable company and apply an adjusted EBITDA multiple to the subject business’ EBIT, NPBT, NPAT or any other earnings base other than EBITDA. Similarly, it is also inappropriate to observe a published Price Earnings (“P/E”) multiple for a comparable company and apply an adjusted P/E multiple to the subject business’ EBIT, EBITDA, NPBT or any other earnings base other than NPAT. 4. The Future Maintainable Earnings figure is simply a 3 year average of the reported historic profits. Accounting profits can easily be manipulated by business owners simply because there is so much discretion available to the business owner. For example; Owner remuneration can be easily adjusted and the actual remuneration package can be disguised by unreported private fringe benefits. Business profits can be channelled indirectly to business owners via related party transactions. Travel and entertainment can be quasi-business related expenditure. The business premises can be owned by related parties with rent charged on a non-commercial basis. In addition to the above discretionary items that may require adjustment to the historic reported profits, the following are some additional considerations which may warrant it inappropriate to adopt a 3 year historic average of reported net profits: Expenditure or income relating to surplus assets (eg property) may be included in the profit & loss statements thus distorting what is the business’ normal earnings. The business requires significant future capital expenditure which is different to historical levels. The business suffers from a shortage of working capital either due to seasonality or more systematic liquidity issues. The products/services sold by the business and/or the industry it operates has passed through the maturity phase into a decline phase. The business operates in a volatile industry with fluctuating profitability. Despite what is apparent from so many valuation reports, simply averaging the last 3 years of reported profits is not a standard valuation procedure! What is appropriate is to attempt to ‘normalise’ the operating profits of the business and apply professional judgement to form a view that the level of normalised operating profits can be sustained into the future. 5. There is an insufficient understanding of the business to justify the discount or capitalisation rate. From a layman’s perspective, one of the biggest ‘mysteries’ of many valuation reports is how the valuer arrives at a discount or capitalisation rate. The valuer may be criticised, rightly or wrongly, that the report is devoid of any market data supporting the discount or capitalisation rate. The reality is that for many non-listed entities, particularly smaller businesses, is that there is very little, if any market data available on what the discount or capitalisation rate should be. Even if market data is available, there are often more reasons to not blindly rely on the data and apply a good dose of professional judgment regarding the discount or capitalisation rate based on the valuer’s understanding of the economy, industry and business specific risks. A high quality business valuation report will include sufficient detailed about the valuer’s understanding of how the business operates in isolation and within its environment. S.W.O.T analysis, Porter’s 5 Forces analysis, Life Cycle Analysis are all relevant analytical frameworks available to a business valuer to guide and rationalise the professional judgement applied regarding the discount or capitalisation rate. 6. Inappropriate valuation methodology and/or lack of cross check valuation methodologies. It is commonly stated that valuation is an art, not a science. I personally do not subscribe to this kind of commentary but I do admit that ‘value’ can be highly subjective – one person might perceive little value in a business whereas another person may perceive something very different. The challenge for valuers is to not become exposed to the vagaries inherent in simply stating that professional judgement has been applied and rationalise the basis for selecting the valuation methodology. Where possible, the valuer should look to adopt different valuation methodologies to cross-check or sense-check the valuation conclusion. 7. The valuation report was too cheap which compromised its quality. While in most commercial settings, the professional fees for the preparation of the valuation report will not be known, in litigation settings it is relatively easy to obtain this information. In some instances, it may be possible to establish that the published author of the report may have hardly worked on the report with a junior (who may not have formal professional qualifications) doing a significant bulk of the work in order to deliver a report for the quoted fees to win the job in the first place. In preparing a valuation report, there are often standard paragraphs and standard processes which can be followed which can lead to ‘cookie-cutter’ mentality by some firms offering cheaper valuation services advertising streamlined processes. All valuation reports prepared for litigation purposes will need to state compliance with court rules. With cheap reports, it’s not too difficult to find something that does not comply with court rules – usually that something is the lack of reasonable inquiries made by the valuer to support the veracity of material assumptions provided to him/her. Summary… If you are staring at a valuation report that doesn’t quite sit well with you, contact us.
By Adam Giliberti May 28, 2023
This article addresses the considerations of an expert, tasked with quantifying claims for loss of profit, as part of claim for damages or compensation, as it relates to a ‘but-for’ scenario. This article also addresses the key documents that instructing plaintiff lawyers would likely need to help procure from its client to assist the expert to quantify damages.
By Adam Giliberti January 23, 2023
The assessment date in the context of damages represents the point in time all of the losses, typically which may have accrued and continue to accrue over a period of time, are converted to a single number representing a ‘once-and-for-all’ lump sum amount as part of damages. This article focuses on the technical and thorny issues concerning the assessment date in damages and compensation.
By Adam Giliberti November 29, 2022
This paper is intended to provide guidance to those interested in valuation of cryptocurrencies, being a new type of intangible asset.