From the cases, it is apparent that in determining whether a professional met the requisite standard of care, the following should be considered: 1) the standard is that of an ordinary professional; 2) it is to be assessed at the time the work was done; 3) if he applies his opinion with reasonable competence it is sufficient if a professional follows the accepted body of professional opinion, even if there is opinion to the contrary; 4) the professional does not guarantee that his work will be successful. Provided he exercise reasonable judgment, competence and diligence doing the work, a professional may be incorrect without being negligent or in breach of contract. Wilson v. Swansen, 1956 CanLII 1 (SCC), [1956] S.C.R. 804 at 812.
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