There are many circumstances that can affect the quality of a product or service in a business — that’s why Six Sigma quality tools are great. These 7 quality tools can be and are used in other phases of DMAIC as well as DMADV.
The 7 quality tools include:
- Stratification (Divide & Conquer): Here data is divided into smaller subcategories. These subcategories are divided into groups based on the information that they most cover, and the specific information given in these subgroups help solve an existing issue.
- Histogram: These contain information on the frequency of specific occurrences that have to do with the issue needed to be resolved.
- Check Sheet: An easy way to display both qualitative and quantitative data that is gathered for analysis; also called a tally sheet. This is great in understanding where in the progress that defect patterns happen.
- Cause & Effect Chart (Fishbone or Ishikawa Diagram): This diagram is extremely useful in problem solutions as well as identifying the root causes for an issue.
- Pareto Chart (80-20 Principle): This chart is based on 20% of causes resulting in 80% of effects. The Pareto charts help us visualize through the chart that the majority of end results come from a minority of actions or causes for defects.
- Scatter Diagram: This is a mathematical chart that correlates a set of two variables for specific data.
- Control Chart (Shewhart Chart): This is a great tool for observing all pertinent processes over time. This tool makes it easy to see the variation and pinpoint its occurrence.
These quality control tools help in gathering important data that will make quality improvement based on facts and not on arbitrary guesses. Keep in mind that the Voice of Customer (VOC) is of utmost importance since fulfilling the customer’s requirements is the reason you are in business, and without your customers, you won’t have a business or company.
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