Using the Galley Servicing Delay data and the Excel OM plugin, create a statistical process control chart (SPC) (use the c-chart and make sure to click on the graph box). While this method is best used in manufacturing, you can apply the principles to our problem. Since the management wants to tightly control the error rate, use a standard deviation (z value) of 2.

Event	Sun	Mon	Tues	Wed	Thur	Fri	Sat
Galley servicing delayed	3	6	11	5	5	4	10
Missing galley support staff	2	3	6	4	3	3	7