Control charts are used
to monitor the output of a process. They
are used to give timely warning of 'special
causes' entering the process. They generally
monitor either the process mean, the process
variation or a combination of both.
Control charts have an upper and lower
'Control Limit'. A point plotting outside
these limits indicates a 'special cause'.
Certain other patterns of points also indicate
a 'special cause'.
Pass your mouse over the image
to see a point outside a control
limit , indicating that the process
Control charts can be divided into two
types; control charts for attributes and
control charts for variables. Types of control
Other relevant topics in this glossary