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A Toolbook for Quality Improvement and Problem Solving (contents)

Line Graph: When to use it

The Quality Toolbook > Line Graph > When to use it

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


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When to use it

  • Use it when an item is repeatedly measured, to show changes across time.
  • Use it when measuring several different items which can be shown on the same scale, to show how they change relative to one another.
  • Use it when measuring progress towards a goal, to show the relative improvement.
  • Use it, rather than a Bar Chart, to show continuous change, rather than discrete measurements. It is also better when there are many measurements.
  • Use it, rather than a Control Chart, when not measuring the degree of control of a process.


Fig. 1. Using the Line Graph in problem solving




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