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A Six Sigma quality level generates fewer than 3.4 defects per million operations in a manufacturing or service process. GE is running at a Sigma level of three to four. The gap between that and the Six Sigma level is costing the company between $8 billion and $12 billion a year in inefficiencies and lost productivity.

The main idea of the paragraph

The gap between the GE quality level and the Six Sigma level is costing the corporation between $8 and $12 billion a year in inefficiencies and lost productivity, which convinced Welch that GE should adopt the Six Sigma program.

由于通用电气质量水平与“六西格玛”质量水平的差距，因为效率低下以及生产力的损失，通用电气一年付出的代价达到80至120亿美元，这使得韦尔奇相信通用电气应该实施“六西格玛”项目。

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