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Check Sheet: Practical variations

The Quality Toolbook > Check Sheet > Practical variations

When to use it | How to understand it | Example | How to do it | Practical variations


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Practical variations

  • A Process Distribution Check Sheet measures the frequency of a single item across a range of measures, visually showing the distribution. These are interpreted as histograms.
  • A Defective Item Check Sheet counts and classifies defects by type, as below. If the expected ordering is known (e.g. the Pareto sequence), then the Check Sheet can be designed with this ordering set up, so any deviation may be detected. These may be interpreted as Pareto Charts (and can be redrawn as such).



Fig. 1. Defective Item Check List


  • A Location Plot (or Defect Location Check Sheet or Concentration Diagram) uses a picture of the item to mark defect positions, as below. Problem areas are usually indicated by clustering of marks.



 Fig. 2. Location Plot


  • A Defective Cause Check Sheet aims to correlate cause and effect, by including possible causal factors, such as time of day, operator, machine and location. It can also be used as a part of a controlled experiment. In order to correlate many factors, it can get quite complex (and thus be quite a design challenge!).
  • A Checklist (or Check-up Confirmation Check Sheet) contains a list of actions or results of actions which are ticked as they are done (such as during the service of a motor vehicle). The complete checklist then becomes a certificate of completion. Simple checklists are often a good solution for problems where important activities get forgotten.



Fig. 3. Check-up Confirmation Check Sheet


  • A Work Sampling Check Sheet is used to analyze how time is spent, by classifying the type of activity being done at randomly selected moments throughout the day.
  • A Traveling Check Sheet moves with a product through production and forms a complete running record of all tests and inspections. This can form a useful certificate of completion.



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