With regard to investing pension assets, Canadian law of the past was especially detailed, prescribing strictly what allocations could and could not be made and under what conditions. Beginning in 1987 with the Pension Benefits Act of Ontario, regulatory frameworks across the country were gradually revised to make the investment decision-making process of fiduciaries more broadly, if no less stringently, guided by the "prudent person rule." Generally speaking, this rule states that a fiduciary must exercise care, diligence and skill in her or his decisions as one person might in handling another's property under common law. The prudent person rule is now the central underlying theme of pension regulation and supervision in Canada, as it is in Australia, New Zealand, the United Kingdom and the United States.Endnote 23

Under this rule, the process by which an investment decision gets made is the central focus, and not strictly the outcomes of that decision. This means that pension fiduciaries can and should be judged according to whether they exhibit the legally-ascribed qualities of prudence as they allocate and manage assets with reasonable expectations of returns. By extension, they cannot necessarily be held accountable for poor returns resulting from unforeseen market circumstances or sheer bad luck, unless it is apparent that imprudent fiduciary behaviours led to this end. Put another way, the prudent person rule will be deemed fulfilled if, throughout the hierarchy of roles and responsibilities among trustees and their agents, attention has evidently been paid to cautious, informed and transparent decision-making.