Page 84 - DMGT206_PRODUCTION_AND_OPERATIONS_MANAGEMENT

Unit 4: Quality Control

Notes
Did u know? What is a run chart?

A run chart is a line graph that shows data points plotted in the order in which they occur.
Usage of run chart

 They are used to show trends and shifts in a process over time, variation over time,
or to identify decline or improvement in a process over time.

 They can be used to examine both variables and attribute data.
 In case of problem, this information is helpful to understand the magnitude of a
problem.

Figure 4.9: A Typical Run Chart

Pie Charts

 Pie charts represent quality factors as slices of a pie: the size of each slice is in proportion
to the number of occurrences of the factor.

 A pie chart is used to show how a part of something relates to the whole.
 These charts are useful for showing data from a group of factors that can be represented as
percentages totaling 100 per cent.

Figure 4.10: A Pie Chart

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