ABSTRACT
Information systems contain interrelated processes. Control charts are proactive management tools that can be used to help control, predict, and improve the processes found in information systems as well as processes in general. A control chart allows an analyst to categorize a process as either stable or unstable. Control charts are also useful in monitoring stable processes and notifying the analyst if and when a given process moves to an unstable state. The use of control charts is a central part of the Total quality management movement as espoused by Deming and other quality gurus. Control charts are statistical tools that help analysts determine whether the output from a process is predictable or unpredictable. Control charts are also used to monitor a process to detect changes in the process and, therefore, changes in the outputs from the process. A process is said to be unstable if a point plotted on a control chart is outside the control limits.
