Number of non - conforming defects Distinction between characteristics and data types in control chart formulation and selection strategies for control charts of different data types This article focuses on the formulation of control charts, emphasizing that in the early stage... Data type distinctionMeasurement data Explore the selection methods of quality management control charts under different circumstances amidst the gloomy weather and exhaustion. The author of this article felt physically and mentally exhausted in the rainy weather, but still focused on work... The sample size remains constantCountable data