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Production Line Efficiency by Sabry Shaaban

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Unbalanced Service Time Means and Variabilities

A moment’s thought will tell us that human skills and abilities being what they are, it is reasonable to suppose that employees working on an assembly line will probably display different characteristics in the way they work. Some will work fast in general—in other words, they will have low operation mean times but vary quite considerably (i.e., they will have high coefficients of variation). Others will work fast and be quite steady in their pace (i.e., they will combine low mean operation times with low coefficients of variation). In other cases we can imagine slow and steady operators or slow and variable operators.

As discussed earlier (see Box 2.1), the speed and variability can also be a result ...

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