The conventional image of construction is an amalgamation of a series of manual and semi-manual activities. This concept is highly misleading. Construction projects, today, are high-tech, highly mechanized, and complex. A typical construction project is characterized by the consumption of numerous types of materials, variety of tools, equipment, plants and machinery working in tandem, several different contracting agencies, big and small, sub-contractors, petty contractors, vendors and suppliers, area specialists, consultants, supervisors and managers, each with independent organizational setups, participating with complex interactions, working in cooperation, sometimes even at cross purposes. In addition to this highly interactive and complex environment at a construction site, thousands of activities each of different nature are arranged simultaneously, many of them, sequentially or at random. Thus, the construction project today is much more complex than any other production process, manufacturing, or service industry.