Process Improvement Blog

    iNSIDER Perspective | An Overview of Six Sigma

    Posted by Guest Post

    Jan 30, 2013 11:10:50 AM

    This article was written by iNSIDER Craig Reid.


    In my last post, I overviewed the most popular business process improvement methods, including the oft criticised but much used, Six Sigma. Let’s take a deeper dive into Six Sigma.

    Origins & Popularity

    Although invented by Motorola in the nineteen eighties, Six Sigma’s rise to global popularity was not just as a result of Motorola’s success with the method. GE boss Jack Welch became the poster boy of Six Sigma as GE hurtled toward a committed path of making Six Sigma part of their organisation’s “DNA”.

    The wave of enthusiasm that resulted from the cost cutting success of Motorola and GE spawned a whole generation of Six Sigma consultants and an entire industry in Six Sigma training. The frenzy of process improvement opportunity within manufacturing quickly transferred to services businesses who expanded the method across their international boundaries.

    How it works

    Six Sigma has a defined structure by which projects are undertaken. The DMAIC approach focusses on improving existing processes whilst the DMADV approach focuses on the design of new processes:

    1. DMAIC
    • Define what is required to be improved
    • Measure the process
    • Analyze the data
    • Improve the current process
    • Control the improved process

    2. DMADV
    • Define the design of the new process
    • Measure required capabilities
    • Analyze options
    • Design the process
    • Verify the selected process design

    Each of these approaches require significant measurement and data analysis, commonly using a range of statistical techniques ranging from the simple Pareto Chart to more complex tools such as Control Charts and even data analysis software such as Minitab.


    Six Sigma has been heavily criticized for a number of reasons. Those businesses operating in service environments have been reluctant to indulge in heavy statistical analysis which is seen to be inappropriate in non-manufacturing environments where the focus is on knowledge work rather than measuring “widgets”.

    Furthermore, Six Sigma has been criticized for being too time consuming to implement projects and for the fact that its focus is on improving existing processes blindly rather than questioning whether the process should actually exist at all.


    When used in a practical manner, Six Sigma can be an excellent means of identifying where key process problems occur. Whilst not all of the statistical methods are required for every situation they are several excellent tools which can help to improve processes.

    Some of the most useful of these tools are the most simple, such as The Five Whys and SIPOC Analysis.

    More by Craig Reid:

    6 Ways to Process Improvement Success

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