variability

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variability

a characteristic of SERVICES, namely that being delivered by people, the standard of their performance is open to variation.
References in classic literature ?
Opinions on such subjects vary much in different countries,” said Marmaduke; “but it is not as ornaments that I value the noble trees of this country; it is for their usefulness We are stripping the forests, as if a single year would replace what we destroy.
His expression, his manner, his very soul seemed to vary with every fresh part that he assumed.
For where a man cannot choose, or vary in particulars, there it is good to take the safest, and wariest way, in general; like the going softly, by one that cannot well see.
Hear her say not vary, and us dining at three, and loonching off pasthry thot aggravates a mon 'stead of pacifying him
As many more individuals of each species are born than can possibly survive; and as, consequently, there is a frequently recurring struggle for existence, it follows that any being, if it vary however slightly in any manner profitable to itself, under the complex and sometimes varying conditions of life, will have a better chance of surviving, and thus be naturally selected.
The relative proportions of these two faculties vary greatly in books of different sorts.
Despite these repeated losses, the IRS continues to mandate that the telecommunications carriers collect the Communications Excise Tax from taxpayers with respect to services the per-call charges for which do not vary based on distance (the telecommunications carriers are collection agents for the IRS with respect to the tax).
Reading the language of the statute to require the tax to be imposed on charges that vary by both time and distance, taxpayers have sought refunds of long-distance calls, for which the charge varies only on time, not on distance.
Questions such as: "Why do prices vary from day to day?
This is an advantage as it is often necessary to vary material flow during the pour to accommodate the varying features of intricate automotive parts.
Since both distance and time were factors in determining toll charges when Congress enacted section 4252(b)(1), "it intended for the word 'and' to be read conjunctively to mean that a charge must vary by both distance and elapsed transmission time, and not by one or the other.