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Every year over 90,000 job seekers from across the globe enter Canada to work temporarily to help Canadian employers address skill shortages.
 
Most foreign workers seeking to enter Canada to work temporarily must hold a valid working visa. It is illegal for a Canadian employer to employ a foreign national who does not have a valid work permit. However, a work permit is not required if the proposed activities in Canada are required in or beneficial to Canada – regardless of the labor market conditions or unemployment rates in Canada.
 
Canadian immigration policy dictates that a work permit can only be applied for after the steps below have been taken:
 
First Step: You must receive a written job offer from a Canadian employer; If you do not have a written job offer, you cannot apply for a work visa. 
 
Second Step: Human Resources and Development Canada (HRDC) must normally provide a labour market opinion or confirmation of your job offer. The Immigration and Refugee Protection Regulations mandates HRDC to furnish labour opinions confirming the impact of a prospective temporary or a permanent hiring of a foreign national on the labour market. The majority of temporary hiring of non-Canadians will require a favourable HRDC labour opinion confirming that a prospective temporary hiring is genuine and is likely to have a neutral or positive economic effect on the affected local labour market.
 
Third Step: Once HRDC grants a confirmation for the job that the foreign worker has been offered, the worker may apply for a work permit at a visa office, or, if the worker is a U.S. citizen, at a port of entry.

Usually HRDC validation is a decisive part of the procedure to obtain work permit. 
 
Note that accordingly with the Canada-Quebec Accord on immigration, a foreign worker seeking to work in Quebec must also obtain the authorization from the Quebec immigration authorities.