6 sigma 六標準差1/9
Trouver Yin teaches 95c the introduction to 6-sigma
100%Quality IS possible. Let The Ujigami Guy show you how… www.watchover.us Slide 5 – History of Quality STATISTICAL QUALITY CONTROL (Part of a slide show series presented to the Detroit Chapter of the American Society of Quality on March 23, 2010) “In 1924, our perception that quality required inspection, changed when Walter Shewhart, who we now recognize as the Father of Statistical Quality Control introduced the Control Chart. Shewhart framed the quality problem in terms of assignable-cause variation and chance-cause variation and introduced the control chart as a tool to distinquish between the two. Shewhart’s work pointed out the importance of reducing variation in a manufacturing process and the understanding that continual process adjustment in reaction to non-conformance actually increased variation and degraded quality. If we are chasing problems, we are creating more noise in our process than if we just understand normal cause variation and manage that variation. In 1946, Shainin drew upon Shewhart’s concepts to demonstrate to the Navy Bureau of Aeronautics that Lot Plot processing was more effective than 100% inspection. Following this, the Navy agreed to make Lot Plot a standard and soon Lot Plot was adopted as a standard across many industries. Based on current studies, we know that visual inspection is only about 85% effective. Statistical methods were widely applied during WWII, but faded into disuse a few years later in the face of HUGE overseas demand …
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