Measurable vs Non-Measurable Items

Sepasoft MES Module Suite

SPC Charts - Datasets for Chart Types

Measurable items vs. Non-measurable items use different chart types.

Measurable items: Values as floats and integers.

Non-measurable items: Attributes e.g., cracks, something missing, error in formulation.

Measurable items use Value ChartsNon-measurable items use Attribute Charts
  • XBar Range
  • Individual
  • Median
  • XBar Standard Deviation
  • Process Capability
  • Process Performance
  • P chart: percentage of nonconforming when total inspected varies
  • NP chart: percentage of nonconforming when total inspected does not vary
  • C chart: analyzes the number of nonconformities
  • U chart: percentage of nonconformities of total inspected
  • Process Capability
  • Process Performance


Nonconforming: single reason referred to as defective. e.g. 10 product units with no logo

Nonconformities: multiple reasons referred to as defects. Viewed commonly based on time or product type other, e.g. in 30 days product had  30 cracks,  10 with no logo, and 15 with chips















Sepasoft MES Module Suite