Where a dispute between expert witnesses is capable of rational resolution by examination and analysis, and no adverse credibility findings have been made against any expert, a trial judge's decision based solely on the 'eminence' or 'impressive' demeanour of one expert will not constitute adequate reasons and may be set aside on appeal. A trial judge who intends to rely on personal knowledge of an expert's reputation must disclose this to the parties and give them an opportunity to deal with it. The Fox v Percy principle regarding the trial judge's advantage in assessing credibility does not preclude appellate intervention where the judge's reasons reveal a failure to follow the precepts for resolving expert disputes.
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