If employed carry T4s for the qualifying residence window - some Citizenship Officers (COs) take the view that NOA income may not necessarily prove your job/income is Canada based. In reality the CO has a couple of minutes to make a call on if you need 'extra' attention so they typically skim (albeit one would expect with expertise and to an extent a gut feel I guess) over proffered documents. The CIC 'test/interview' team usually have to get a few hundred people through testing in a 2 hour window especially now CIC has a one year routine process commitment and there is an election looming with all parties keen on getting as many votes read oaths done by then!
