p-chart: When is it used?

Use p-charts when you can answer yes to these questions:

1. Do you need to assess system stability?

2. Is the data a count of nonconforming items per subgroup?

3. Can the counts be converted to proportions?

4. Are there only two outcomes to any given check?

5. Is the time order of subgroups preserved?

See also:
>p-chart: What is it?
>p-chart: What does it look like?
>p-chart: Getting the most