01 · Purpose
Why and when to use it
Use it to show how a complete total is divided; use a bar chart when precise category comparison is more important.
Who takes part?
The measurement owner works with people who understand the process and the recorded data. Statistical or measurement-system decisions should involve someone able to check the assumptions and study design.
02 · Application
How to apply it
Start with an agreed measurement purpose, explicit units and trustworthy observations. Identify missing cases and assumptions before calculating.
- Define the total population or count being divided.
- Check that categories are exclusive and cover the total.
- Calculate each count divided by the total.
- Label sectors with names and percentages; avoid 3D distortion.
- State the period and denominator and check that shares sum to 100%.
03 · Example
A worked measurement example
Original fictional teaching example. Small datasets illustrate the method; they are not proposed as sufficient study sizes. Supplied parameters are assumptions, not estimates from a real process.
| Dispatch issue category | Count | Share |
|---|---|---|
| Missing stock | 50 | 50% |
| Picking correction | 30 | 30% |
| Other | 20 | 20% |
| Total | 100 | 100% |
04 · Interpretation
What the result tells you
Half the classified issues are missing-stock cases. This is a share of these 100 issues, not a 50% failure rate among all orders.
Completion check: A labelled composition chart with a valid total and stated denominator.
05 · Judgement
Mistakes and limitations
Overlapping categories and omitted unknowns invalidate the composition. Small sectors are hard to compare; prefer bars for many categories or close values.
07 · Reading
Sources and further reading
The tool list follows the accepted LeanTrainingLab overview and its reference to Six Sigma+Lean Toolset, second edition (Lunau, editor; Springer, 2013). The book chapters were not available for direct review during this build. Explanations, examples and worksheets are original teaching material. Further reading supplies professional background; local conventions are stated explicitly.