If we are going to solemnize a marriage for our daughter in our house, we usually request or entrust the works to our housepersons first and then to outsiders. Similarly the Government also. The election, survey works are related to Government's portfolio. so, the Government initially entrust such works to its employees and teachers are in the circle. Moreover such works are entrusted to teachers because of their virtue, patience and dedication and also the training time is less as they can grasp the things fast rather than others.