100-Metodos-de-Qualidade-Total

DATA COLLECTION, ANALYSIS AND DISPLAY 197
Method 86
Paynter charts
Purpose
To display information over time in a way that allows changes in patterns
of failure to be discovered. Paynter charts will show when one failure mode
takes over from another in terms of importance or when the overall failure
rate is changing over time.
When to use
When monitoring performance and setting priontles for improvement,
Paynter charts can show changes in patterns of failure over time. They can
also be used to record failures, errors or the occurrence of events that a
team wishes to study and remedy.
How to use
The number of times an event occurs is shown on the vertical axis. The
different time periods are shown on the horizontal axis. The occurrences
are given in rank order with the highest first. The previous ranking is given
for each occurrence. The total for each year is given in the extreme righthand
column.
Benefits
Paynter charts are able to display a large amount of data at one time, as
opposed to having a different chart for each failure mode or occurrence.
By displaying all the data together, a team is better able to see the total
picture.
Example
Figure 1 shows a Paynter chart of the reasons for scrap in an automotive
supplier. The horizontal axis shows changes month by month in the
pattern. The ranking down the left-hand side of the chart shows changes in
importance of the faults. It can be seen that, in the first month, 'No
threads' became more prevalent. The Paynter chart also shows that 'Bad
spray' is an increasingly important failure mode.