The Canadian Labour Force Survey is the largest continuing field survey conducted by the Dominion Bureau of Statistics. It was established as a quarterly survey in 1945 and was altered to a monthly one in 1952. Changes in the basic needs of the users of the survey and changes in the characteristics of the country made it increasingly difficult to cope with the survey without a complete over-haul. The Canadian Labour Force Survey was completely redesigned over a two year period beginning early 1964 and ending December, 1965.