AI-002 | Assessment Insights
Evidence, Opinion and Assumption
Evidence, professional opinion and assumption each play different roles in a vehicle assessment. They should not be treated as interchangeable.
A clear assessment distinguishes what is supported by evidence, what represents the assessor’s professional interpretation and what remains uncertain because reliable information is unavailable.
Evidence
Evidence is the information available to establish or test the facts of a matter.
It may include the vehicle’s physical condition, damage patterns, photographs, measurements, diagnostic information, repair documents, technical procedures, records and relevant correspondence.
Evidence should be examined for its relevance, reliability and limitations. Its value depends not simply on its existence, but on what it can reasonably demonstrate.
Professional Opinion
A professional opinion is a conclusion reached by applying technical knowledge, experience and reasoned judgement to the available evidence.
An opinion should have an identifiable basis. The assessor should explain the relevant findings and reasoning so the reader can understand how the conclusion was reached.
Different assessors may form different opinions, but each opinion should remain capable of being tested against the evidence and technical information relied upon.
Assumption
An assumption is something accepted as possible or likely without sufficient evidence to establish it as fact.
Assumptions may sometimes be necessary where information is incomplete, components are concealed or records are unavailable. When relied upon, they should be clearly identified rather than presented as proven.
A material assumption may affect the strength of the conclusion and may need to be reconsidered if further reliable evidence becomes available.
Why the Distinction Matters
Confusion arises when an opinion is presented as fact or an assumption is treated as evidence.
A sound assessment should allow the reader to distinguish:
• what has been directly observed or reliably documented
• what has been inferred from the available evidence
• what represents professional opinion
• what remains uncertain or has been assumed
Making these distinctions clear improves transparency and allows the assessment to be properly understood, reviewed and tested.
A Simple Example
A photograph may provide evidence that a panel is visibly damaged.
An assessor may form the professional opinion that replacement is required after considering the damage, material, repair access and manufacturer requirements.
It would be an assumption to state that an unseen component behind the panel is also damaged unless inspection, measurement or other reliable information supports that conclusion.
The distinction is important because each statement carries a different level of certainty.
Inspection Access and Strip-Down Decisions
Some damage cannot be reliably established until trims, panels or components are removed and the affected area can be properly inspected.
Authorising dismantling may create additional labour, reassembly and storage costs. It may also reveal further damage and increase the anticipated repair scope. This can result in reluctance to authorise a strip-down before the repair pathway is settled.
However, where a decision about repairability, repair scope or cost is made without access to relevant concealed areas, that limitation should be clearly acknowledged. The uninspected condition should not be treated as confirmed simply because no additional damage is visible.
In these circumstances, the assessment may need to remain provisional until the necessary inspection or supplementary assessment is completed.
Questions to Ask When Reading an Assessment
When reviewing an assessment, consider:
• What evidence was available to the assessor?
• Was the vehicle physically inspected, reviewed remotely or only considered from documents?
• Were relevant areas dismantled and accessible for inspection?
• Which findings are established facts and which are professional opinions?
• Have any assumptions or limitations been clearly identified?
• Could further inspection or additional evidence materially change the conclusion?
These questions help determine how much weight can reasonably be placed on the assessment.
Need Clarity About an Assessment?
If an assessment does not clearly distinguish between evidence, opinion and assumption, an independent review may help identify what has been established and what remains uncertain.
The first step is to review the available material, understand the assessment scope and determine whether further technical investigation is warranted.