Visa Officers are required to consider 5 points in making decisions
whether to grant or deny Visitor Visa applications. Applicants who
tend to be successful with their Canadian visitor visa applications
include documentation and information that shows how and why they
qualify under these five factors.
Read about the 5 Factors for your Canada Visa here:
http://www.visaplace.com/blog-immigration-law/canadian-visitor-visas/canadian-visitor-visas-temporary-resident-visas-are-difficult-to-obtain/