1. Independence and Impartiality

Courts expect experts to assist the court — not the party who engaged them.

An expert report must:

• State that the expert understands their duty to the court

• Confirm they have complied with the Expert Witness Code of Conduct

• Demonstrate independence in tone, reasoning, and conclusions

Any hint of advocacy can undermine the entire report.

2. Clear Statement of Questions and Issues

The report must identify:

• The specific questions the expert was asked to address

• The issues in dispute

• The scope of the expert’s engagement

Courts dislike reports that wander outside the expert’s remit or fail to address the core question.

3. Qualifications and Basis of Expertise

The expert must clearly set out:

• Their qualifications

• Relevant experience

• Professional memberships

• Any specialised training

Courts need to understand why the expert is qualified to give the opinion.

4. Assumptions and Material Relied On

Transparency is essential.

Reports must list:

• All factual assumptions

• Documents reviewed

• Tests conducted

• Data relied upon

• Any limitations in the available information

Courts expect assumptions to be clearly separated from conclusions.

5. Methodology and Reasoning

Judges look closely at how the expert reached their opinion.

Reports must:

• Explain the methodology used

• Show the reasoning process step‑by‑step

• Identify alternative explanations where relevant

• Avoid conclusory statements without analysis

A well‑reasoned report is far more persuasive than a highly credentialed expert with weak reasoning.

6. Compliance With Expert Codes of Conduct

Most courts require strict compliance with:

• Federal Court Expert Evidence Practice Note

• Supreme Court Expert Witness Code of Conduct (NSW, VIC, QLD etc.)

• NCAT Procedural Direction 3 – Expert Evidence

Reports must include:

• A signed declaration of compliance

• A statement acknowledging the expert’s duty to the court

Non‑compliance can result in the report being excluded.

7. Clear, Neutral Language

Courts expect:

• Plain English

• Structured, logical sections

• Avoidance of advocacy or emotive language

• Clear definitions of technical terms

The goal is to help the court understand, not overwhelm it.

8. Identification of Any Limitations

Experts must disclose:

• Gaps in available data

• Uncertainties in their conclusions

• Limitations in testing or methodology

• Any assumptions that materially affect the opinion

Courts value honesty about limitations more than false certainty.

9. Summary of Opinions

Reports should end with:

• A concise summary of conclusions

• Clear answers to each question posed

• Any areas where the expert cannot express an opinion

This helps the court quickly understand the expert’s position.

10. Attachments and Supporting Material

Courts expect:

• Relevant calculations

• Photographs

• Diagrams

• Test results

• References to literature or standards

Supporting material must be organised and clearly referenced.

Common Reasons Courts Reject or Criticise Expert Reports

• Advocacy or bias

• Failure to comply with the Code of Conduct

• Unsupported or unexplained conclusions

• Poor reasoning or unclear methodology

• Overstepping expertise

• Lack of transparency about assumptions

• Failure to answer the actual question

Expert Report Checklist

• [ ] Expert understands their duty to the court

• [ ] Qualifications clearly stated

• [ ] Issues and questions identified

• [ ] Assumptions and materials listed

• [ ] Methodology explained

• [ ] Reasoning clearly set out

• [ ] Opinions supported by evidence

• [ ] Limitations disclosed

• [ ] Neutral, clear language

• [ ] Code of Conduct declaration included