Chapter 4Analyze

Analysis is the process of finding a solution to a problem. This involves two distinct steps:

1. Divergent thinking—to “cast a wide net” and include as many possible solution candidates as one can.

2. Convergent thinking—to identify the best solution.

In the Analyze phase of the Six Sigma project cycle, you must quantify the existing process to determine how best to achieve the process improvement goals. Tools and techniques useful during the analyze phase include:

• Run charts

• Descriptive statistical analysis (central tendency, spread, distribution, outliers)

• Exploratory data analysis (box plot comparisons, stem-and-leaf)

• SIPOC (Supplier, Input, Process, Output, Customer)

• Analytic data analysis (time series, SPC)

• Data ...

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