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Working from what to part is done in surveying in order to in sure.
in Civil Engineering by  

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The fundamental principles upon which the surveying is being carried out are

    working from whole to part.
    after deciding the position of any point, its reference must be kept from at least two permanent objects or stations whose position have already been well defined.

The purpose of working from whole to part is

    to localise the errors and
    to control the accumulation of errors.