If you want to share your experiences regarding how to draw a Scatter Diagram, you can use the comments section. The fishbone diagram enables to define the root cause of a problem where the scatter plot helps to look for a relationship between variables. Some PMP aspirants confuse the fishbone (Ishikawa ) diagram with the scatter plot. In some cases, both of the two variables may be affected by a third variable. If the data don’t cover a wide enough range, the relationship between the variables is not apparent. Scatter diagrams are used to understand the relationships between variables. If the variables are closer to each other, this means that there is a strong (high degree of) correlation between the variables. It can also be called “Scatter Diagram with Low Degree of Correlation”. If the variables are a bit closer to each other, this means that there is a weak correlation between them. Positive Correlation Strong and Weak Correlation The below chart illustrates the same data as a Scatter Plot. The below table shows the working hours and accidents within a project. It is therefore the visual tool of the 5M method. It was developed by Kaoru Ishikawa, a quality management pioneer in the 1960s and originally used as a quality control tool. “Working hours” is the independent data and the number of accidents depends on the working hours. The Ishikawa diagram, also known as the cause-effect diagram or the 5M diagram, aims to identify and organise the causes of a problem into large families, in a visual way. Cause and effect analysis, also called a cause and effect diagram, is an assessment tool that combines brainstorming and mind mapping techniques to explore the possible causes of an issue. He notices that as the working hours increases, the number of accidents also increase. The scatter graph of all the data in the research helps the HSE manager to understand the relationship between the two variables. The HSE manager plots the data in a scatter plot by assigning the “working hours” to the horizontal axis (X-axis) and the “number of accidents” to the vertical axis (Y-axis). Let’s review the following scatter diagram example to understand the topic better.Īn HSE manager collects data for the two variables below in order to understand the relationship between the number of accidents and long working hours within a construction project. In other words, you use the scatter plots to demonstrate how two variables are correlated. They are used to determine the relationship between two variables.
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