20. Expert Evidence
Admissibility, permission, expert duties, reports, questions, joint experts and expert discussions.
How to study for BSB Civil Litigation
Prepare separately for closed-book recall and open-book application while keeping every step anchored to the exact syllabus version for your sitting.
Core concepts
Concept 1
Expert opinion is an exception to the general rule excluding opinion evidence and must be relevant, admissible and within the witness's expertise.
Exam cue: Define the issue requiring expertise and why ordinary factual evidence cannot resolve it.
Concept 2
Expert evidence is restricted to what is reasonably required, usually needs court permission and is governed by directions on reports, questions, meetings and oral evidence.
Exam cue: Check permission, field, named expert, cost and form before relying on a report.
Concept 3
An expert's overriding duty is to help the court independently and objectively, taking priority over obligations to the instructing party.
Exam cue: Distinguish clarification questions, expert discussions and cross-examination by purpose and timing.
Risk pitfalls and guardrails
Treating the instructed expert as an advocate who should omit material adverse to the client.
Guardrail: Do not import a rule or commentary paragraph merely because the White Book cross-refers to it; the BSB syllabus expressly defines what is examinable.
Assuming payment for a report permits reliance on it without court permission.
Guardrail: Do not import a rule or commentary paragraph merely because the White Book cross-refers to it; the BSB syllabus expressly defines what is examinable.
Using written questions as cross-examination or as a route to introduce a new expert case.
Guardrail: Do not import a rule or commentary paragraph merely because the White Book cross-refers to it; the BSB syllabus expressly defines what is examinable.
Memory anchors
Opinion exception
Qualified expert opinion may be admissible where specialised knowledge will assist the court.
Permission first
A party generally needs the court's permission to adduce expert evidence.
Overriding duty
The expert's duty to help the court overrides the duty to the instructing party.
Single joint expert
The court may direct one jointly instructed expert where proportionate.
Expert discussion
Experts identify agreement and disagreement without negotiating the case or being directed to avoid concessions.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
A bystander says a vehicle appeared to travel very fast based on what she saw. Is that necessarily inadmissible expert opinion?
What is an expert witness’s overriding duty?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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