The Court of Appeal decision Sosnowksi v. MacEwan Petroleum provides a useful summary of s. 5(1)(a)(iv) jurisprudence:
[15] This court’s jurisprudence has developed certain principles for the interpretation and application of s. 5(1)(a)(iv).
[16] First, the determination of whether a proceeding is an appropriate means to seek to remedy an injury, loss, or damage depends upon the specific factual and/or statutory setting of each case: Nasr Hospitality Services Inc. v. Intact Insurance, 2018 ONCA 725, 142 O.R. (3d) 561, at para. 46.
[17] Second, this court has observed that two circumstances most often delay the date on which a claim is discovered under this subsection. The first is when the plaintiff relied on the defendant’s superior knowledge and expertise, especially where the defendant took steps to ameliorate the loss. The other situation is where an alternative dispute resolution process offers an adequate remedy, and it has not been completed: Nasr, at para. 50.[18] Third, Sharpe J.A. in Markel Insurance Company of Canada v. ING Insurance Company of Canada, 2012 ONCA 218, 109 O.R. (3d) 652, at para. 34, provided the following guidance concerning the meaning of the term “appropriate”:This brings me to the question of when it would be “appropriate” to bring a proceeding within the meaning of s. 5 (1)(a)(iv) of the Limitations Act. Here as well, I fully accept that parties should be discouraged from rushing to litigation or arbitration and encouraged to discuss and negotiate claims. In my view, when s. 5 (1) (a)(iv) states that a claim is “discovered” only when “having a regard to the nature of the injury, loss or damage, a proceeding would be an appropriate means to seek to remedy it,” the word “appropriate” must mean legally appropriate. To give “appropriate” an evaluative gloss allowing a party to delay the commencement of proceedings for some tactical or other reason beyond two years from the date the claim is fully ripened and requiring the court to assess the tone and tenor of communications in search of a clear denial would, in my opinion, inject an unacceptable element of uncertainty into the law of limitation of actions. [Emphasis in original.][19] In other words, appropriate means whether it is legally appropriate to bring an action. Appropriate does not include an evaluation of whether a civil proceeding will succeed.
It’s also another addition to the jurisprudence considering the impact of a criminal proceeding on the timeliness of a civil proceeding. The outcome of a criminal proceeding may assist in assessing the merits of a civil proceeding, but that’s not a material consideration in the limitations analysis:
[28] The appellant’s principal submission is that he should have been permitted to wait until the criminal proceedings concluded so that he could evaluate his chances of success in litigation. He argues that litigation is an expensive and risky proposition, and he should not have been forced to commence a civil proceeding until he knew that he had a chance of success. This argument, of course, is precisely what this court in Markel said a plaintiff is not permitted to do.
[29] If such an evaluative analysis could effectively stop the running of the limitation period, questions will necessarily follow regarding the nature of that analysis and the factors that could be considered. For example, is it open to a plaintiff to argue that he or she can await the outcome of a related discipline process in a professional negligence claim? May a potential plaintiff commence a claim many years after the events if there is a change in the law that increases his or her chances of success? If a critical witness goes missing and is later discovered, is it open to the plaintiff to assert that he or she did not know whether it was appropriate to bring an action until the witness was found?
