When we select curing agent & clay surface modifier for epoxy nanocomposite, there are lot of options in front of us. There are certain researchers who have either experimented with surface modifiers or curing agents. It is widely known that type of processing method, type of curing agent & type of clay surface modifier decides the final properties of a nanocomposites (of course clay weight percentage). In that case when there are more than one factors that effect the output, is it not apt to use DOE and optimize the final surface property ?