六西格玛管理相关知识(英文版)(ppt 32页)

六西格玛管理相关知识(英文版)内容摘要：
 Sigma is a statistical unit of measure that reflects process capability.  The sigma scale of measure is perfectly correlated to such characteristics as defects-per-unit, parts-per-million defective, and the probability of a failure/error.
20,000 lost articles of mail per hour
Unsafe drinking water for almost 15 minutes each day
5,000 incorrect surgical operations per week
Two short or long landings at most major airports each day
200,000 wrong drug prescriptions each year
No electricity for almost seven hours each month
Seven articles lost per hour
One unsafe minute every seven months
1.7 incorrect operations per week
One short or long landing every five years
68 wrong prescriptions per year
One hour without electricity every 34 years

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