Important] 7'QC Tool part-Histogram

Histogram-5th Tool of 7'QC Tool :

About Histograms :

•  Histograms are the graphs of distribution of data designed to show centering dispersion (Spread) and shape (Relative frequency) of the data.
• This tool used to understand how the output of the process relates to the customer expectation(Target & Specification).
• This tool helps to understand & answer the question " Is the process capable for meeting of Customer requirements ?"

When to Use of Histogram Tool :

• Putting the shape of a distribution and comparing it with specification.
• Histogram is very important tool it is used after collection of data and help to understand the distribution.
• It is widely used in Six-Sigma project.
• It is used when data is numerical.
• When you want to see shape of data distribution.
• Whether the output of the process is distributed normally.
• When analyzing whether the process can meet the customer requirements.
• When analyzing  what a output from supplier's process look like.
• When seeing whether a process change has occurred from one time period to another.
• When determining whether output of two or more  processes are different.
• When you wish to communicate distribution of data quickly and easily to others.