Six Sigma Definition

Six Sigma is a data-driven quality management methodology aimed at minimizing process or product variability to the maximum extent. It is based on statistical principles, striving for no more than 3.4 defects per million opportunities over an extended period. This approach emphasizes data collection, analysis, and improvement to ensure process stability and consistency.



Six Sigma Application Environment

Six Sigma is applicable to various organizations and industries, including manufacturing, services, healthcare, and finance. It can be applied to production processes, supply chain management, product design, customer service, and various decision-making processes. Regardless of the organization's size, as long as there is complexity and variability, Six Sigma can provide a path for continuous improvement.



Benefits of Using Six Sigma

  • Improving Quality: The primary goal of Six Sigma is to reduce the defect rate, thereby enhancing the quality of products and services. Through data analysis and improvement, organizations can better meet customer expectations and reduce the occurrence of quality issues.
  • Enhancing Efficiency: Reducing variability contributes to improved process efficiency. The Six Sigma methodology helps organizations identify and eliminate waste, reduce cycle times, and enhance production capacity.
  • Reducing Costs: By decreasing the defect rate and improving efficiency, Six Sigma helps organizations reduce production costs. This includes reducing waste, lowering maintenance expenses, and increasing resource utilization.
  • Boosting Customer Satisfaction: By delivering higher-quality products and services, organizations can increase customer satisfaction, enhance customer loyalty, and ultimately gain a larger market share.


DMAIC Methodology in Six Sigma

  1. Define: In this stage, the project's goals, scope, and key performance indicators (KPIs) are determined. A clear definition of the problem is crucial for the project's success.
  2. Measure: Relevant data is collected, and the current process performance is analyzed. This stage helps understand the process's baseline and identify existing issues.
  3. Analyze: Statistical tools and techniques are employed to identify potential root causes, explaining why the problem occurs. This ensures that the solutions are targeted.
  4. Improve: In this stage, improvement plans are developed and implemented to reduce variability, enhance quality, and efficiency. The best solution is selected, and pilot tests are conducted.
  5. Control: The control phase aims to ensure ongoing improvement and prevent problems from recurring. Monitoring measures are implemented, and processes are standardized to maintain the improvement's effectiveness.



DMADV Methodology in Six Sigma

  1. Define: Determine the goals and customer requirements for the product or service. Clearly outline the project scope and objectives.
  2. Measure: Collect and analyze data about the existing process and product to establish performance benchmarks.
  3. Analyze: Determine the root causes of the problem by analyzing data, providing a foundation for the design phase.
  4. Design: Develop a new product or service design based on previous analysis. This includes engineering design, process design, etc.
  5. Verify: Ensure that the new design meets customer requirements and achieves the expected performance level through testing and evaluation.



Six Sigma Certification Levels

In Six Sigma, there are different levels of certification to denote an individual's training and experience:


  1. White Belt: White Belts typically receive basic awareness training in Six Sigma within the organization. While they may not directly engage in projects, they have a basic understanding of Six Sigma principles and methods. White Belts play a supportive role in Six Sigma projects, spreading knowledge and assisting with data collection and analysis. They may participate in project teams and contribute significantly to the team.

  2. Green Belt: Green Belts receive more in-depth Six Sigma training and often serve in support roles within project teams. They possess higher levels of knowledge and skills and can be more directly involved in project implementation. Green Belts are typically responsible for specific aspects of a project, using Six Sigma tools for data analysis, root cause identification, and improvement planning. They play crucial roles in project teams.

  3. Black Belt: Black Belts are experts who have undergone extensive training and accumulated experience in Six Sigma. They usually lead Six Sigma project teams and are responsible for comprehensive project management, including problem definition, data collection, analysis, development and implementation of improvement plans, and monitoring and control. Black Belts possess advanced statistical and analytical skills, capable of addressing complex issues and driving improvement. They often coordinate multiple projects and hold leadership positions within the organization.

  4. Master Black Belt: Master Black Belts are senior professionals who often take on leadership and training roles within the organization. They have profound knowledge and experience and can guide multiple projects and teams. Master Black Belts play a critical role in disseminating and implementing the Six Sigma methodology. They train and mentor other Black Belts and Green Belts and help build a Six Sigma culture within the organization.

  5. Diamond Belt: The Diamond Belt is the highest level of Six Sigma certification, representing exceptional knowledge and leadership abilities in the field. Diamond Belts are typically strategic decision-makers and consultants, providing advanced strategic guidance to the organization. They possess extensive knowledge and experience, capable of addressing complex problems and driving strategic change within the organization.


Different levels of certification ensure that the organization has the appropriate skills and knowledge to drive Six Sigma projects and achieve quality improvement objectives. Organizations can train and certify their employees based on their needs and goals to ensure they have the right roles and capabilities in Six Sigma projects.



Layana's Six Sigma Certification Levels
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Champion 1 Layard Lai
Master Black Belts 3 Penny Lin (General Manager), TN Chen (Vice GM), Mike Lai (President-CN)

Black Belt


Alex Lai (President-TW), Jenny Yang (Consultant), Carrie Yao (Vice GM), Ming-Jie Shih (MFG Manager), Jack Lee (Manager), Mark Chen (Manager), Molly Yang (Manager), Debbie Shih (Manager), Jian-Yao Yang (R&D Vice GM), Shr-Chin Lee (Manager), Yi-Hsin Chen (Manager)

Green Belts

12 David Chen (Assistant Manager), Amanda LU(Assistant Manager), Sophia Yeh (Assistant Manager), Bonnie Lai (Assistant Manage), Cheng-Du Lin (Assistant Manager), Ming-Hong Guo (Assistant Manage), Ji-Shan Sun (Section Manager), Shun-Yang Chang (Assistant Manager), Yu-Neng Chen (Facility Engineer),Yi-Ren You (Supervisor), Yao-cheng Yang (Supervisor), Wei-Lun Zhang (specialist)



Six Sigma is a powerful quality management methodology that can help organizations improve quality, reduce costs, enhance efficiency, and increase customer satisfaction. Through the DMAIC method, organizations can identify issues, find root causes, and implement continuous improvement. Furthermore, different levels of certification (Green Belt, Black Belt, White Belt, Master Black Belt, and Diamond Belt) ensure that organizations have qualified individuals to drive this process.


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2024 Seventeenth Six Sigma Project Event

The 2024 Sixth Standard Deviation Project was held on January 19th.
Six Sigma, a management methodology and quality management system, endeavors to augment the quality and efficacy of products or services by minimizing variability. One notable project this year marked Layana's inaugural venture into the DMADV Six Sigma design methodology, distinguishing it from the more prevalent DMAIC method commonly employed in factory manufacturing

1982 founder

2023 Sixteenth Six Sigma Project Event

Since 2000, Layana has been using Six Sigma projects for improvement, addressing long-standing issues in our work. The core values of "Pursuing Excellence, Stopping at Perfection" lie in quality and cultural ideals. We must uphold the spirit of Six Sigma, continually innovate, and strive for excellence. Through years of experience in various products, including parts manufacturing, we seek mutual development with our customers, aiming to achieve excellence and continuous improvement.


2021 Fifteenth Six Sigma Improve Project Event


Fourteenth Six Sigma Improve Project Event


Thirteenth Six Sigma Improve Project Event


Twelfth Six Sigma Improve Project Event


2015 Tenth Six Sigma Improve Project Event

1982 founder

2016 Eleven Six Sigma Improve Project Event 

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2013 Eighth Six Sigma Improve Project Event

1982 founder

2014 Ninth Six Sigma Improve Project Event

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Taiwan Training Quality System Silver Prize granted


SPC was implemented


ISO9001 Certificate of Design and Manufacture of Flatware granted in November.


5S coached by China Productivity Center in March.


ISO/TS16949:2002 certified. Third Six Sigma Project Event in Kaohsiung.  ERP System implemented in August.


Second Six Sigma Project Event in Taichung. Six Sigma methods coached by China Productivity Center in March.


First Six Sigma Project Event in Taipei.  ISO/TS16949:2002 Implementation coached by Kind Consulting in November.


TPS/Lean techniques implemented to eliminate Seven Wastes.


QS-9000 was implemented


Six Sigma Training Courses was launched



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