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T
he check sheet is a simple and effective tool useful in lean Six Sigma projects. It is sometimes referred to as a concentration diagram or location plot. It is a handy tool for qualitative and quantitative data gathering and analysis. Check sheets help to systematically collect and organize data and are useful in all phases of the define, measure, analyze, improve, control (DMAIC) statistical and analytical method used in lean Six Sigma.
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Check sheet vs. check list
People sometimes confuse a check sheet with a check list. The list we use for groceries and the report you get from the auto repair shop with items checked off after service (oil, filter, tire pressure, tread, etc.) are examples of a check list. The following table highlights some key differences between a check list and a check sheet.
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Check Sheet |
Check List |
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A tally sheet to collect data on frequency of occurrence |
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Tukey tally methods
John Tukey came up with some handy methods for tallies. Rather than the four sticks and a fifth diagonal one as is customary in North America, he recommended forming square boxes with a diagonal for the fifth count. As one reviews data quickly for a particular defect, one doesn't have to look at the paper to see where to place the marks as often. The four sides of a square can be drawn and a diagonal can be drawn without lifting the writing instrument from the paper. The other useful technique is the stem and leaf plot. This not only provides the histogram but also a sense of which values predominate in the bins. Tukey's book about Exploratory Data Analysis (EDA) is a worthwhile read.
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