Six Sigma quality reduces variation. A Six Sigma bell curve covers 99.999% of a given process’s outcomes. The graphic effect of a smaller standard deviation, s, is illustrated on the left. The bell curve shrinks so only 3-4 defects per million (DPM), can occur.

Research Methodology:

A garment production process faces numerous kinds of problems leading to quality defects and subsequent alterations and rejections of the product. The implementation or application of Six Sigma starts with the recognition of a problem, and the defining of a project to cure or alleviate that problem. DMAIC methods can be used for the improvement of Structured and Repeated process, Focus on defects reduction and Existing product and process improvement.

DMAIC, which stands for Define, Measure, Analyze, Improve and Control. These are defined further as:

DEFINE: This phase involves the definition of the project/assignment, using process map, application area, desired improvement, likely benefits, etc. The importance lies in having the chance of any of the following factors such as

• Revenue Growth
• Cost Reduction’
• Capital Reduction
• Key Business Objectives
• On Time Delivery
• Lead Time
• Quality
• Customer Satisfaction


MEASURE: This phase involves the analysis of the process to determine its present state and the future, as obtained. Data collection is the main emphasis of this phase and Evaluating the measurement system to ensure the reliability of data.

Measurement is a means of communication. Six Sigma is largely the applied science of measurement. Knowing how to measure, when to measure, what to measure, and how to record measurements for maximum value are essential 6s skills. Measurement skills depend on measurement knowledge.

COPQ : Cost of Poor Quality (Prevention Cost, Failure Cost etc)
RTY : Roplled Throughput Yield
DPU : Defects per Unit
DPMO : Defects per million Opportunities
Process capability Index
Sigma Level