An engineer conducted an experiment with three factors (A, B, and C) at two levels on a new, untried process. The eight runs suggested that one level of factor A showed significant improvement. The plant manager said no additional runs are needed. The experimenter's response should be:

A)-in the process of engineering design, explain the contribution of material selection. b)- explain the procedure of synthesis as is employed in engineering design. c)- is there any relationship between ergonomics and engineering design? explain. d)- safety consideration in engineering design includes human, product and the enviroment . explain how safety will be incorporated into the design?