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Six Sigma initiatives try to optimize the manufacturing process such that it automatically produces parts conforming to Six Sigma quality. In contrast, Design for Six Sigma (DFSS) optimizes the design itself such that the part conforms to Six Sigma quality even with variations in manufacturing. (DFSS) is a methodology for enhancing the speed and quality of the design processes inside an organization. Organizations use DFSS when they have to design or re-design a process, product, service or transaction. For design Six Sigma and Robust Design quality is an explicit goal of the optimization process.
The DMADV Methodology
What is DMADV Methodology?
- Define: You will define the goals of the project and that of the customers (both internal and external).
- Measure: Here you will quantify the customer needs as well as the goals of the management.
- Analyze: Analyze the options, existing process to determine the cause of error origination and evaluate corrective measures.
- Design: Design a new process or a corrective step to the existing one to eliminate the error origination that meets the target specification.
- Verify: Verify, by simulation or otherwise, the performance of thus developed design and its ability to meet the target needs.
There is a new viewpoint in Six Sigma circles that DMADV is for designing new products and services and that it may not be successful on existing business processes and products. Although the argument is valid to some extent, you would do well to notice that the I of DMAIC is not far removed from the D of DMADV. You can easily say that design is an extended concept of improvement.
Difference between DMADV And DMAIC - The difference, as one can see now, exists only in the way last two steps are handled. In DMADV, instead of the Improve and Control steps which focuses on readjusting and controlling by one way or other, deals with redesigning the process to fit customer needs.
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