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How To Reduce Errors With Six Sigma Methodology?

Six Sigma is a business approach for quality improvement that assesses flaws in a present process and aims to methodically eradicate them. It is a procedure that uses statistics and data analysis to examine and minimize errors or flaws. Its goal is to decrease manufacturing defects to no more than 3.4 faults per million units or events while increasing cycle times. Moreover, Six Sigma can be applied to any industry including manufacturing, health care, human resource, and finance to improve business processes. 

Six Sigma Methods
Six Sigma Methods

Six Sigma Methodology

Six Sigma is one of the most promising techniques for improving the effectiveness and efficiency of business processes. Customer satisfaction is the main goal of Six Sigma, and several techniques are used to enhance the performance of a product or business process in order to achieve this goal. Six Sigma provides tools and procedures that reduce variation, remove defects, and aid in identifying the root causes of errors, enabling firms to provide better customer goods and services.

DMAIC and DMADV are the main methodologies of Six Sigma that apply to different business environments. According to a study, the use of the Six Sigma methodology reduced errors in the fine grinding process from 16.6 to 1.19%. The DMAIC technique has significantly improved the company’s financial performance in terms of lower scrap costs, fewer man hours spent on rework, and higher production.

Six Sigma Methods to Reduce Defects

Data collection

The research team works along with other key teams within the organization to gather data inputs from various departments using the Six Sigma methodology. After data gathering, the information is loaded into pertinent software like Minitab to identify statistical inputs that demonstrate variance and the specific location of the waste. Following reports, a literature review will be conducted in order to comprehend the historical experience of prior change efforts within the organization for process improvement.

Literature Review

The Greek letter, sigma has been used as both the mathematical symbol and metric of difference in operation. Calculation sigma scale is closely related to characteristics like per-unit faults, parts-per-million faults, and failure rates. The defect rate for six sigma is 3.4 per million. Businesses must reduce variation to increase a process’s sigma number and ensure that the process is handled appropriately. 

Define, Measure, Analyze, Improve, and Control (DMAIC) are the five steps of Six Sigma, which are primarily used to improve process performance and reach organizational goals. It also minimizes process and product to achieve high levels of quality by removing the root cause(s) of defects.

  • Define phase – defining the problem and the project scope as well as the needs and expectations of the customer.
  • Measure phase – data can be gathered, elaborated, and the essential process characteristics can be measured.
  • Analyze phase – the root causes of the problem can be determined the experiments and statistical techniques can be conducted. 
  • Improve phase – identify areas for improvement and choose the best ones to minimize or eliminate defects.
  • Control phase- focuses on ensuring that the improvements are maintained and preventing a reversal in process performance.

Applying Methodology 

The DMAIC and Six Sigma methodologies are used to identify the current issues, ascertain their underlying causes, and establish the most effective strategy for minimizing or eliminating them. DMAIC technique involves defining the problem first. The next step is to gather enough data to evaluate the process’s performance and identify the Critical to Quality (CTQ) requirements. The cause and effect diagram and the Pareto diagram should be used to assess all potential causes.  Following that, several quality improvements were assessed utilizing the design of experiments and regression analysis approaches. In the end, appropriate processes should be implemented in place to ensure maintaining the achieved improvements and preventing the process performance from deteriorating.

Regression analysis

Regression analysis is most associated with the analysis phase of the five-step Six Sigma method of DMAIC. It is one of many tools of the Six Sigma analysis phase which is used to find areas of waste. This method enables the use of data to make predictions and measure whether outcomes match expectations when a process variable is altered. Following the identification of potential root causes for the major flaws in the evaluation process, a regression analysis will be conducted to determine the relationship between particular elements and the number of pieces rejected.


Six Sigma is a methodology that is driven by data and statistics. It is used by businesses to eliminate defects and improve any of their processes to boost their profits. In order to understand the Six Sigma methodology, individuals can opt for Lean Six Sigma Yellow Belt Training. Attending the training course helps professionals to gain in-depth knowledge of methodologies. Moreover, it aids in developing skills in selecting methodologies to optimize and enhance business operations.

Posted in Quality Management

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