Chart a nonconforming item is a unit of product that

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Chart A nonconforming item is a unit of product that does not satisfy one or more of the specifications for that product. Each specific point at which a specification is not satisfied results in a defect or nonconformity
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Nonconformities (Defects), c Chart Consequently, a nonconforming item will contain at least one nonconformity. However, depending on their nature and severity, it is quite possible for a unit to contain several nonconformities and not be classified as nonconforming.
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Nonconformities or c Chart
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Nonconformities or c Chart
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Example
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The table presents the number of nonconformities observed in 26 successive samples of 100 printed circuit boards. Note that, for reasons of convenience, the inspection unit is defined as 100 boards. Set up a c chart for these data.
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Control Chart for Average Number of Nonconformities per Unit
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