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
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.
A control chart is a specific type of a graph shows data points between upper and lower limits over a period of time. These 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.
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
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.