To find initial feasible solution of a transportation problem the method which starts allocation from the lowest cost is called method

Operations research, often shortened to the initialism OR, is a discipline that deals with the development and application of analytical methods to improve decision-making. The term management science is occasionally used as a synonym. (Source: Wikipedia)

Examples of operation research models are: a map, activity charts balance sheets, PERT network, break-even equation, economic ordering quantity equation etc.