We have traditionally worked with Statistics Canada in the development of the questions, starting years before the survey begins. We have at times had ad hoc working groups that have supported Statistics Canada, particularly in things like advising on media or issues that arise in the census.
The advice we give tends to be more in terms of what end users need. That would be the core of our advice, as well as providing, where it's appropriate, supplemental technical advice to the deep expertise that StatsCan already possesses.