The schedulilng of hours of work is undoubtedly one of the major social problems of industrial society. Statistic estimates that 30% of Canada's workforce are involved in some kinds of shiftwork. Of those, 33% work irregular shifts, just under 30% work rotating shifts, 17% work long term evening shifts, 10% work on call, 3% work split shifts, 3% work long term night shifts and just over 3% are classed as "other". Present estimates tell us that before the trend slows, fully 35% of the workforce will work some type of shiftwork (Siroonian 123). Companies are feeling the need to maximize their efficiency