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What is SPC?
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•  A histogram is a graphical representation of a frequency distribution. It can help in assessing the shape, center and spread of a data set.
•  A histogram is appropriate to use when your data set has at least 30 observations.
•  The total range of the data is divided into a number of intervals of equal size (called intervals, classes, cells or bins).
•  The number of observations falling into each interval is accumulated and displayed as bars of a histogram.
Pareto Principle
•  80% of the problems are linked to only 20% of the causes
•  Useful when establishing priorities for improvement