ABSTRACT
In Chapter 4, we studied a method of extracting the required information in the form of the single (main) effects of the factors under study and the interactions of these factors. We will now raise a question concerning the cost aspect from our definition of an efficient experiment. We must always keep in mind the balance that must be maintained between information and cost. To develop this point, we shall examine a rather trivial example and then expand into a real, extensive experiment. Before discussing these examples, we will look at the information content of 2k factorials in general.
