White Burgess, and how to instruct a schedule expert

01 What the Court held

The Court held that an expert's lack of independence and impartiality goes to the admissibility of the evidence, in addition to being weighed if the evidence is admitted (para. 45). The expert's duty is to give evidence that is fair, objective and non-partisan, and that concern is addressed in the "properly qualified expert" element of the Mohan framework, because a proposed expert who is unable or unwilling to comply with the duty is not properly qualified to act as an expert (paras. 46 and 53).

The threshold is not onerous. Absent a challenge, the expert's attestation or testimony recognizing and accepting the duty will generally be enough to establish it (para. 47). Once the expert attests, the burden shifts to the party opposing admission to show a realistic concern that the expert is unable or unwilling to comply; if that concern is raised, the burden of establishing this aspect of admissibility on a balance of probabilities rests on the party tendering the evidence (para. 48). Exclusion at the threshold stage should occur only in very clear cases of inability or unwillingness, and anything short of that goes to the weighing of costs and benefits rather than to exclusion (para. 49).

What matters is the nature and extent of the interest or connection, not the bare fact of one: a mere employment relationship with the retaining party will usually not disqualify, while a direct financial interest in the outcome, a very close family relationship with a party, exposure to professional liability if the opinion is rejected, or an expert who assumes the role of advocate are treated as serious (para. 49). Apparent bias is not the test; the question is whether the interest or relationship leaves the expert unable or unwilling to carry out the primary duty to the court (para. 50). Impartiality concerns that survive the threshold are weighed again at the gatekeeping cost-benefit stage (para. 54). On the facts the appeal was dismissed with costs and the accountant's evidence was admissible (para. 63).

02 What the threshold is actually worth

Read the structure of paragraphs 47 to 49 together and the practical shape of the test appears. The expert attests. The opponent must raise a realistic concern. Only then does the tendering party have to prove this aspect of admissibility, and exclusion follows only in a very clear case of inability or unwillingness. Everything else is weight.

That structure has a consequence each way, and both are worth saying plainly.

03 The four serious categories, translated into construction scheduling

Paragraph 49 identifies a direct financial interest in the outcome, a very close family relationship with a party, exposure to professional liability if the opinion is rejected, and an expert who assumes the role of advocate as serious, while confirming that a mere employment relationship with the retaining party will usually not disqualify. Three of the four arise on construction files far more often than people expect, and one of them is close to endemic.

Exposure to professional liability if the opinion is rejected

This is the endemic one. The consultant who prepared the extension of time submission during the project, or who built and maintained the schedules that the analysis now examines, or who certified the baseline as reasonable, has a personal stake in the correctness of that earlier work. If the opinion is rejected, their own prior work is what has failed. That is materially different from a mere employment relationship with the retaining party, because the interest is in the expert's own position rather than in the client's.

It is also the most common way expert evidence gets damaged in construction disputes, because prior involvement looks like an advantage. The consultant who lived through the project knows the file, has the records, and can be up to speed in a week. The client sees efficiency. The other side sees an expert grading his own homework.

A direct financial interest in the outcome

The clear case is a fee that depends on the result: a contingency, a success fee, an uplift tied to the amount recovered, or a fee payable only out of proceeds. There is no version of this that is safe for an expert whose evidence is going to a court, and no efficiency argument that survives the cross-examination.

The less obvious case is economic dependence. A small practice may take most of its work from one law firm or one contractor. On the language of paragraph 49 what matters is the nature and extent of the interest or connection rather than the bare fact of one, so a commercial relationship is not by itself the problem. It is still a fact the expert should be ready to state accurately if asked, without minimising it, because an evasive answer about fee sources does more damage than the underlying fact.

The expert who assumes the role of advocate

In schedule analysis, advocacy has a recognisable technical signature. It is not usually a rhetorical problem, and the reports that fail on this basis often read as sober. What gives it away:

• The method was chosen after the answer was known. Different analytical approaches produce different numbers on the same records, and an analyst who selected an approach because of what it produced, then justified it afterwards, is advocating.
• The event list is one-sided. Every event attributable to the other party is analysed, and the retaining party's own delays appear nowhere, or appear as a paragraph of acknowledgment with no dates and no measurement.
• Alternative runs were performed and not disclosed. This is the schedule equivalent of the discarded draft, and it is discoverable in the working files.
• Constraints, open ends and calendar choices that favour the result are used without disclosure, when each of them changes the number.
• The prose characterises conduct. Words such as unreasonable, egregious, wilful and inexcusable are conclusions about a party, not findings about a schedule, and they are the tell that most readily transfers from a claim submission into a report because the same person often wrote both.

A very close family relationship with a party

Rarer, and easily managed, but worth asking about on a file involving a family held contractor, a family held developer, or a small regional market where the same names recur. Ask the question at retainer, in writing, and record the answer.

04 Instructing the expert

Because the attestation generally establishes the threshold absent a challenge (para. 47), and because the realistic concern that defeats it usually comes from the expert's own conduct and documents, the instruction letter is the single most effective control available to counsel. Write it on the assumption that it will be produced and read aloud.

1. State the question in the form a decision maker will have to answer, and not in the form of the answer you want. "Determine the extent to which the events listed in Schedule A affected the date for completion, and identify any other causes of the change in that date" is a question. "Quantify the owner's delay" is a brief.
2. Label the assumptions. Where the expert is directed to assume a matter of fact or a legal characterisation, say so expressly, and require the report to identify each such assumption and to state its effect on the opinion if the assumption fails.
3. Identify the document set and who chose it, and instruct the expert to say in writing if the material is insufficient to answer the question. An expert who received a filtered set and did not ask for more will be examined on both facts.
4. Instruct on the legal framework, not on the conclusion. Telling the expert that the contract sorts delay causes into categories, and identifying the categories and the dates the contract fixes, is necessary: an analysis that does not map onto the clause is useless however neutral it is. Telling the expert which category an event belongs in is not instruction, it is dictation.
5. Require disclosure of all prior involvement with the project, the parties, the personnel, and any earlier version of the claim, including work done by anyone else in the expert's practice.
6. Require the sensitivity cases to be run and reported: the result with and without any completion date constraint, on each candidate calendar, and with the retaining party's own delays included. Ask for them in the instruction so they are part of the mandate rather than a concession extracted later.
7. Require the expert to state what would change the opinion. An expert who cannot answer that has not tested the opinion.
8. Fix the fee basis with no link to the outcome, and record it.
9. Record every later instruction, including oral ones, and any change to the question. Undocumented changes to the mandate are one of the most damaging things a cross-examiner can find.
10. Require the expert's own attestation recognising and accepting the duty to give evidence that is fair, objective and non-partisan, in the form the applicable rules require.

05 Framing the report

The duty described in paragraph 46 is to give evidence that is fair, objective and non-partisan. A report demonstrates that structurally or not at all, and the structure is not difficult.

Separate the layers, and label them

Facts taken from the record, with the source for each. Assumptions, with their origin, whether from instruction or from the expert's own judgment. Method, with the reason for the choice. Analysis. Opinion. When those five are interleaved, the reader cannot tell which parts of the conclusion depend on an instruction, and neither can the expert.

Say what else was considered, and why it was rejected

Method selection is where the advocacy argument usually lands, so meet it in the report. Name the approaches that were available on this record, say which one was used, and say why the others were not suitable, in terms of the records rather than in terms of the result. An analyst who did this before running the numbers can say so.

Disclose every run

Including the ones that did not help. If the completion milestone was constrained and removing the constraint changes the answer, both numbers belong in the report. If two candidate calendars give different day counts, both belong in the report, with the reason for preferring one. This is the practice that most reliably distinguishes a report from a submission, and it costs nothing except the discomfort of publishing an unhelpful number.

Make it re-runnable

State the files used, with enough identification that the same files can be located and the analysis repeated. State the software and version, the calendars, the data dates, and any change made to the schedules for the purpose of the analysis. An opinion the other side cannot reproduce is an opinion that has to be taken on trust, which is exactly what the duty is meant to remove. It also protects the expert: an analysis that can be re-run can be defended line by line.

Write in the register of a record, not a case

Report what the schedule shows and what the documents show. Leave the characterisation of conduct to counsel. A delay report does not need a single adjective about the other party to be devastating, and the ones that carry them are the ones that get cross-examined on tone before anyone reaches the arithmetic.

06 The adverse finding test

There is one practical marker of impartiality that carries more weight with a construction decision maker than any attestation, and it is not mentioned in the case because it is not a legal test.

This has a corollary for counsel. If the expert brings back a set of adverse findings, that is the expert doing the job, and it is information the client needs while they still have options. The moment to learn that four of the eleven events are unprovable is before the position is committed to in a submission, not after the other side's report arrives.

07 Reference table

Paragraph references from the judgment, for use when drafting or responding.

9 rows, complete. Paragraphs 45 to 54 and 63 only. No other part of the judgment is summarised here.

08 What is uncertain, and what this does not reach

• The Ontario rule and form that require an expert to acknowledge the duty are not cited in this note, because they were not part of the verified set for it. The attestation practice is settled and familiar; cite the current rule and form from the Rules text rather than from this note, and check for recent amendments to the form's contents.
• This note does not survey how White Burgess has been applied since 2015, in Ontario or elsewhere. No later decision is cited because none has been verified here. On a live motion that body of authority is where the argument will actually be won, and it needs to be researched properly.
• Interim adjudication under the Construction Act is not a court proceeding, and nothing in the statutory timetable requires an adjudicator to apply an admissibility test at all. There is no gatekeeping ruling in a thirty day process, so impartiality problems show up as weight, quietly, with no reasons devoted to them. The sensible working assumption is to prepare the evidence as though the court test applied, because it may later.
• In arbitration, the applicable rules and the tribunal's own practice govern how expert evidence is received. That is outside this note.
• The line between instructing an expert on the legal framework and directing the conclusion is a matter of judgment, not a bright rule, and the fourth item in section 04 is my working test rather than a statement of law.
• Nothing here is legal advice, and none of it substitutes for reading the judgment. The paragraph references are given so that the propositions can be checked at source, which is the only safe way to use them.

09 Practical points

1. Ask about prior involvement with the project before the retainer, in writing, and include the whole practice.
2. Do not retain the consultant who prepared the claim during the project as the expert on that claim, unless there is no alternative and the position is disclosed at the front of the report.
3. No fee linked to the outcome, in any form.
4. Write the instruction letter as a question, and read it back as opposing counsel would.
5. Instruct on the contractual framework and the dates that matter. Do not instruct the categorisation of events.
6. Put the sensitivity runs in the mandate: constraints removed, each candidate calendar, retaining party's own delays included.
7. Record every change to the instructions, including oral ones.
8. Require the attestation of the duty in the form the applicable rules require.
9. Structure the report in labelled layers: facts, assumptions, method with reasons, analysis, opinion.
10. Disclose every run performed, including the unhelpful ones, and every choice that changes the number.
11. Make the analysis re-runnable: files, software and version, calendars, data dates, and every change made for the analysis.
12. Expect adverse findings, and treat a report without any as a warning about the report rather than a win.
13. If attacking, aim the impartiality material at weight and keep the exclusion motion for conduct rather than position.