“Expert testimony can be pivotal in influencing the outcome of litigation”

Leaders League: As an expert witness, how do you approach complex legal cases, and what key factors do you consider when providing your testimony?

Javier Sánchez Llopes: I approach complex legal cases with a structured and methodical process. First, I ensure I have a comprehensive understanding of the project and contractual framework, as well as the specific issues in dispute. This often involves analysing substantial volumes of documentation, including project schedules, financial records, correspondence, factual witness statements and expert reports.

The key factors I consider when providing testimony are impartiality, clarity and evidence-based reasoning. I ensure my analysis and conclusions are robust and grounded in verifiable data, adhering to recognized methodologies for quantum or delay assessments. My role is not to advocate for any party but to assist the tribunal by providing a clear and unbiased expert opinion within my field of expertise.

What are the biggest challenges you face when serving as an expert witness, particularly in high-stakes or contentious litigation cases?

One of the biggest challenges is dealing with the complexity and volume of information in high-stakes disputes. Construction and engineering projects often involve intricate schedules and extensive financial data, requiring detailed analysis to identify and isolate the critical factors relevant to the dispute.

Another significant challenge is the adversarial nature of litigation. Cross-examination can be intense, and opposing counsel may attempt to discredit your testimony or identify inconsistencies in your analysis. Staying composed and maintaining clarity and consistency under pressure is essential.

“The key factors I consider when providing testimony are impartiality, clarity and evidence-based reasoning”.

Managing stakeholder expectations can also be difficult. While my role is to provide an independent opinion, parties sometimes have strong views on the case’s merits, often based upon their personal involvement throughout the project, and balancing transparency with professional detachment is critical.

In your experience, how critical is expert testimony in influencing the outcome of litigation, and what distinguishes effective expert witness testimony from less impactful contributions?

Expert testimony can be pivotal in influencing the outcome of litigation, particularly in disputes involving technical, quantum or scheduling issues. Tribunals often rely heavily on expert opinions to understand complex matters beyond their own expertise.

Effective expert testimony is distinguished by its independence, clarity, technical rigor and its ability to assist the Tribunal with its award or decision. It is not just about being correct but about presenting findings in a way that is logical, easy to follow and supported by evidence. An effective expert also anticipates and addresses potential challenges to their analysis, demonstrating thoroughness and objectivity.

“One of the biggest challenges as an expert witness is dealing with the complexity and volume of information in high-stakes disputes.”

On the other hand, testimony that lacks coherence, appears biased or is overly technical without adequate explanation can weaken a party’s position and undermine the expert’s credibility.

How do you prepare for court appearances or depositions as an expert witness, and what strategies do you use to communicate complex information clearly and persuasively to arbitration tribunals?

Preparation for arbitration hearings or depositions is thorough and multi-faceted. I begin by reviewing all relevant documents, including my expert reports, opposing expert reports, and any additional evidence submitted in the case. This ensures I have a comprehensive understanding of the issues and my analysis is consistent with the evidence.

Anticipating questions from both counsel and tribunal members is a critical part of my preparation. I focus on potential areas of challenge, ensuring I can explain and defend my conclusions confidently and with supporting data. Practicing my responses to hypothetical scenarios or cross-examination helps refine my delivery under pressure.

“Effective expert testimony is distinguished by its independence, clarity, technical rigor and its ability to assist the Tribunal with its award or decision.”

When communicating with arbitration tribunals, I adopt a structured and clear approach. I avoid technical jargon and explain concepts in straightforward terms, tailoring my language to the tribunal’s likely level of familiarity with the subject matter. Visual aids such as charts, delay analyses and financial summaries are invaluable for illustrating complex points and maintaining engagement.

I also remain mindful of the need to be concise and focused in my responses, ensuring I address the tribunal’s concerns directly while maintaining my independence and objectivity.