The use of quantitative methods such as statistics in pursuit of quality control and quality improvement has been with us since the thirties. Despite extensive training of entire corporate staffs-from CEOs to janitors-the tangible benefits of learning and using even the simplest statistical methods elude many. Numerous quality schools and movements have abandoned quantitative approaches in favor of the 'human' side of quality. They miss the fact that, just like a popular model of the brain, quality has both 'left' and 'right' sides, and like the brain requires both sides to operate and intercommunicate in order to function well.
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