c-chart

The c-chart is a type of Control Chart which is used to monitor a process over time and to distinguish between common and special cause variation for discrete count datawhen analyzing the number of occurrences of a specific event given equal areas of opportunity Read...

p-chart

The p-chart is a type of Control Chart which is used to monitor a process over time and to distinguish between common and special cause variation for discrete attribute datawhen analyzing the proportion of an item with a specific attribute Read also:...

u-chart

The u-chart is a type of Control Chart which is used to monitor a process over time and to distinguish between common and special cause variation. for discrete count datawhen analyzing the ratio of number of occurrences of a specific event per unit Read also:...

Process Stability

A key concept in Operational Excellence (and Lean Six Sigma) is the distinction between variation that is due to common vs. special causes. The process is stable, or “in control” when there is only common cause variation. The main tool to distinguish...

np-chart

The np-chart is a type of Control Chart which is used to monitor a process over time and to distinguish between common and special cause variation for discrete attribute datawhen analyzing absolute values of items with a specific attribute given equal population sizes...