"Engineering is the professional and systematic application of science to the efficient utilization of natural resources to produce wealth. "
Ralph J. Smith
"Engineering is the professional art of applying science to the optimum conversion of natural resources to the benefit of man. "
N. W. Dougherty
"The ideal engineer is a composite ... He is not a scientist; he is not a mathematician; he is not a sociologist or a writer; but he may use the knowledge and techniques of any or all of these disciplines in solving engineering problems. "
L. M. K. Boelter
"Engineers participate in the activities which make the resources of nature available in a form beneficial to man and provide systems which will perform optimally and economically. "
Henry G. Stott
"Engineering is the art of organizing and directing men and controlling the forces and materials of nature for the benefit of the human race. "