In product, process and manufacturing industries, the work environment and value adding facilities are stationary. Hence, the work environment and facility layout can be optimally designed, provided and controlled. The raw material in the form of job moves from one facility to another adding value at each stage of operation.
On the contrary, on a construction site, the product is stationary, while value is added at each stage of operation by moving the faculty fr~m one construction stage to another; from place to place, frostbite to site and from level to level, all these operations are undertaken under different uncontrolled environmental conditions. The temperature, visibility, humidity, air current speed and other climatic parameters are constantly changing on a minute to minute basis. Most of the time, the work is to be carried out from a highly unsatisfactory condition of partially completed unfinished structures and temporarily assembled, hazardous working platforms. For both horizontal and vertical movements of input materials, human resources, equipment etc., the conditions are continuously changing.
Thus, managerial techniques developed and perfected for other industries cannot as such be used on construction sites. These are required to be modified or new techniques developed to satisfy the constraints of construction sites.
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