"Traceability of measurement" is
defined to "The property of the result of a measurement or the value
of a standard whereby it can be related to stated references, usually
national or international standards, through an unbroken chain of
comparisons all having stated uncertainties " in VIM: International
Vocabulary of Basic and General Terms in Metrology (1993)
Why is traceability of measurement important ?
Clock of Zanzibar Island
Once upon a time, in the Zanzibar Island.
A retired captain makes a rule of a "DONG" at noon every
day for people.
The old captain sets the time of his watch by the clock in a shop
of the island.
The clock shop sets his clock by the captain's "DONG".
By the way, which time is correct?
The answer is that... maybe both are correct and either of them could
be a standard in the island.
Then, what should they do to adjust their time to those outside of the
island ?
It would be neccesary for them to ensure the treaceability of measurement.
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