With the 2011 census under way, Canadians are being urged to think about future generations when they sit down to complete either the short- or long-form census that arrives in the mail this week. While the short-form census continues to be mandatory, the National Household Survey, formerly known as the long-form census questionnaire, will be voluntary for the first time.

That change, along with another made in 2006 giving Canadians a choice on whether to allow their census data to be made public 92 years from now, has left archivists, historians and genealogists concerned.

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