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| x & r charts |
A control chart which is a representation of process capability over time; displays the variability in the process average and range across time. |
| yellow belt |
A Yellow Belt is any employee who has received introductory training in the fundamentals of Six Sigma. The Yellow Belt gathers data, participates in problem-solving exercises and adds their personal experiences to the exploration process. Yellow Belts should have basic high school level math and reading skills. |
| yield |
The measurement, also known as return, of the output (such as production units or a dividend) as a percentage of the input (raw material or price paid for a stock or bond). |
| zero defects |
A quality philosophy based on the idea that a level of perfect quality, as in zero defects, is achievable and should be a company-wide goal. It emphasizes the examination of all factors that lead to quality problems versus a system that builds in an average or acceptable quality level. See Six Sigma. |
| zero float |
A project activity condition of no excess or slack time, where delay in the activity delays the next activity or possibly the entire project. |
| zero inventory |
A term initially used to represent the optimum stock level in a just-in-time system and the idea that inventory is a liability instead of an asset. |
| zone picking |
A warehouse order picking scheme utilizing zones in which pickers select materials within their own area only and the total material required for the order is later grouped together. |
| z-scores |
Sometimes called “standard scores,” Z-Scores are a special application of the transformation rules. The Z score for an item indicates how far, and in what direction, that item deviates from its distribution’s mean, expressed in units of its distribution’s standard deviation. The z score transformation is especially useful when seeking to compare the relative standings of items from distributions with different means and/or different standard deviations. |
