“On a summary judgment motion, the evidence need not be equivalent to that at trial, but must be such that the judge is confident that she can fairly resolve the dispute. A documentary record, particularly when supplemented by the new fact-finding tools, including ordering oral testimony, is often sufficient to resolve material issues fairly and justly. The powers provided in Rules 20.04(2.1) and (2.2) can provide an equally valid, if less extensive, manner of fact finding.
This inquiry into the interest of justice is, by its nature, comparative. Proportionality is assessed in relation to the full trial. It may require the motion judge to assess the relative efficiencies of proceeding by way of summary judgment, as opposed to trial. This would involve a comparison of, among other things, the cost and speed of both procedures. (Although summary judgment may be expensive and time consuming, as in this case, a trial may be even more expensive and slower.) It may also involve a comparison of the evidence that will be available at trial and on the motion as well as the opportunity to fairly evaluate it. (Even if the evidence available on the motion is limited, there may be no reason to think better evidence would be available at trial.)
In practice, whether it is against the “interest of justice” to use the new fact-finding powers will often coincide with whether there is a “genuine issue requiring a trial”. It is logical that, when the use of the new powers would enable a judge to fairly and justly adjudicate a claim, it will generally not be against the interest of justice to do so. What is fair and just turns on the nature of the issues, the nature and strength of the evidence and what is the proportional procedure.
The “interest of justice” inquiry goes further, and also considers the consequences of the motion in the context of the litigation as a whole. For example, if some of the claims against some of the parties will proceed to trial in any event, it may not be in the interest of justice to use the new fact-finding powers to grant summary judgment against a single defendant. Such partial summary judgment may run the risk of duplicative proceedings or inconsistent findings of fact and therefore the use of the powers may not be in the interest of justice. On the other hand, the resolution of an important claim against a key party could significantly advance access to justice, and be the most proportionate, timely and cost effective approach.”