A C chart is a control chart for the number of nonconformities per area of opportunity. An assumption made when constructing a C chart is that:

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An assumption made when constructing a C chart is that the size of each area of opportunity remains constant.
Key Takeaway: A C chart is constructed to track the number of nonconformities (also known as occurrences) per area of opportunity. For example, a software developer may need to track the number of errors per page of code. Unlike other control charts, the size of the area of opportunity must remain constant.

A C Chart Is a Control Chart for the Number