I'll do my best to answer that question, Mr. Chair.
Intention is absolutely a very difficult concept. How can I say it? It's both art and science.
An officer who's processing an application will note the stated reason for a visit. The officer will take a look at the applicant's total circumstances. They'll look at their ties to their home country, ties to Canada, motivation to return, possible motivation to not return after their stated visit. They'll look at their financial circumstances. They'll take a look at their immigration history: whether they've visited Canada before, whether there were any abuses associated with previous visits. They might look to see whether there had been any issues with respect to partner countries and this individual's attempts to travel, or successes in travelling there in the past.
How do you assess intent? At the end of the day, it comes down to judgment. When we prepare visa officers for posting, first, we select them because we believe they do have a good sense of judgment, and then we spend time working with them to help them refine that judgment.
There are always quality assurance exercises that go on with admissions. Program managers follow up on decisions to make sure officers are in fact exercising good judgment. They look for consistency across decision-makers, to make sure it's not the luck of the draw as to whether or not you get a visa depending on which officer you're interacting with.
There are reference materials prepared and reports that are shared amongst officers. Officers inform themselves of the local circumstances.
All of these things come together as both art and science in assessing intent.