Control Chart versus Run Chart in Quality Control

Control Chart versus Run Chart
Control Chart versus Run Chart

Control Chart versus Run Chart

Control Chart and Run Chart are are two basic Quality Control tools. Both of them are used for evaluating and analyzing quality results within a project. A lot of people mix up these two different tools for quality control. This article will try to explain the similarities and differences between Control Charts and Run Charts.

According to PMBOK Guide, there are seven tools for Quality Control. These tools are below

– Check sheet
– Control chart
Fishbone Diagram (Cause-and-effect diagram)
– Flowchart
Histogram
Pareto chart
Scatter diagram

Run Chart



A run chart is a simple chart shows data points over a period of time. The displayed datas in a run chart mostly show trends, performance of a manufacturing etc.
A run chart helps you analyze the following over time:
– Changes or trends of the process
– Cycle of the process
– Performance of a process

Benefits of Using a Run Chart



The following are a few benefits of a Run Chart:
– It is a visual tool which is easy to use
– It enables to determine the performance of a process easily
– It does not require much technical skills.

Run Chart
Run Chart

Control Chart



A control chart is a specific type of a graph shows data points between upper and lower limits over a period of time. Control Charts commonly have three types of lines such as upper and lower specification limits, upper and lower control limits and planned value. By the help of these lines, Control Charts show the process behaviour over time.

Control Chart
Control Chart

Benefits of Using a Control Chart



The following are a few benefits of a Control Chart:
– It enables to specify the stability of a process.
– It enables to specify the regions where the quality needs to be improved or where the corrective actions need to be taken.
– It enables to analyze the variations between the given limits

Summary



Both Control Charts and Run Charts are generated by placing the data within a given period. However, Control Charts include upper and lower control limit lines. Depending on the targets of the project, the most suitable chart should be selected. Generally Control Charts give more specific information and understanding to the process, compared to the Run Charts.

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