Six Sigma

What is Six Sigma | Process | DMAIC & DMADV in Six Sigma

“Six Sigma is a set of methods and tools for business process improvement and quality management. Six Sigma aims to improve quality by finding defects, determining their cause, and improving processes to increase the repeatability and accuracy of process results. By improving efficiency and decreasing defects, the quality and timeliness of product delivery improves, and with it, ideally, employee enthusiasm and confidence–and the company’s bottom line. “

What’s in the name? “Six Sigma”

Six Sigma derives from statistical process modeling in manufacturing. A sigma is a measure of standard deviation, abbreviated as small s, or the Greek letter, σ. Something that is within +/-6s, Six Sigma, from the centerline of a control chart was created by a process that is considered well controlled. In other words, there is little deviation from the standard and is within tolerance. Six Sigma is sometimes written as 6σ. Motorola trademarked the name in the 1990s with capital letters.  


Six Sigma Projects follows two Methodologies. 




pronounced duh-may-ick, focuses on incrementally improving existing processes. It is the most widely known methodology and the one most associated with Six Sigma. Here’s a breakdown of the acronym: 

D: Define customer needs, requirements, and project goals.

M: Measure the key aspects of the current process. According to McAdams, “This is when you start to understand your process and collect data on it.”

A: Analyze data. “You really dig into what types of errors occur and where they occur so you can target the big ones. It’s always looking at that 80/20 rule. Let’s see if we can find 20 percent of the reasons that give us 80 percent of the defects and let us reduce those,” says McAdams.

I: Improve processes. Test and verify that the improvements work.

C: Control future implementations of the processes to ensure that errors don’t creep in again. 


pronounced duh-mad-v, focuses on optimizing new products or processes to Six Sigma standards. Here’s a breakdown of the acronym:

D: Define customer or company goals.

M: Measure CTQs (characteristics that are Critical To Quality), measure product capabilities, production process capability, and risks.

A: Analyze data from your measurements.

D: Design the new process based on the analysis in the previous step.

V: Verify the design through a pilot run, implement the new process, and hand off to the process owner. 

Advantages of Six Sigma

  • Improve Efficiency 
  • Improve Customer Services
  • Improve Accuracy

Disadvantages of Six Sigma

  • Difficult Implementation
  • Time Consuming

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