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CAUTION
Compared to most process improvement efforts, this approach takes a lot of work. To many novices in Six Sigma, it may seem excessive. Many teams are tempted to take shortcuts here, seeking refuge in data streams already available.
We urge you to resist this temptation. Your project's success starts with dependable, customer-focused process metrics. Only occasionally will the methodology shown here bring you back to the data you already collect. Much more often you will discover opportunities to get better data than you currently obtain, which in turn will provide better-than-ever understanding of your processes.