
I’m giving you information to improve your business. If I don’t want to provide my phone number to you, you should not force me to by producing the error:
Please provide an answer to all questions before submitting.
Because:
- I’m doing you a favour by replying.
- I don’t want you to give me a call, about the average customer service.
- In any case, you already have my number (from the rental agreement).

Some Six Sigma definitions which I’ve collected over time.
| Term |
Definition |
| CTQs |
Critical To Quality. The sort list of the most important customer wants. |
| Customer |
Any internal/external person/organisation who receives the output of a process. |
| Customer Requirements |
The needs and expectations of the customer. Which is translated into measurable terms. Used in the process to ensure compliance with customers’ needs. |
| Defect |
Any occurrence or instance where the product/service fails to meet the customers requirements. |
| Defect opportunity |
A type of potential defect on a unit of throughput/output, which is important to the customer. |
| DPMO |
Defects Per Million Opportunities. Calculation used in process improvement initiatives indicating the amount of defects in a process. |
| Sigma |
A statistical term that measures how much a process varies from perfection, based on the DPMO. |
| Six Sigma |
A level of process performance equalling 3.4 DPMO. |
| Standard deviation |
Statistical measure of how much variation there is in a set of data. |
| Variation |
Change/fluctuation of a specific characteristic. Determines process stability/predictability. |

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