Rule 14.05(3) of Ontario’s Rules of Civil Procedure sets out the circumstances when a matter can proceed by way of application, allowing the judge to decide a discrete issue or potentially even the entire case based entirely on a paper record and oral arguments, without hearing from any live witnesses.
In the appropriate case, this allows the parties to circumvent some of the worst aspects of litigation: the costs and scheduling delays associated with discoveries and a full trial.
However, the process is not without risks. Judges retain the ability to convert an application into an action, which means that you could end up right back where you started if the court concludes that further evidence is required.