Standard hour:

In industries like coal mining, where the products are homogeneous, the
calculation of output is relatively simple. But in concerns manufacturing several products it is
difficult to establish a satisfactory basis on which to measure output of the various
departments because of differences in volume of individual products, quality, etc.
The most satisfactory method of common measure is the use of standard hour. ICMA, London,
defines a standard hour as a hypothetical hour, which measures the amount of work which
should be performed in one hour. The standard hour is thus a unit of work and not of time.