Use the journal to practice determining which design is better. Don uses data for a product, but the techniques can be applied to comparing designed experiments for making products, implementing processes or studying people. You can also view the video of this session.
Don reminds you that before using the Remove Estimable Effects script button in the journal, you must create a table based on the matrix found under the Alias Matrix outline box in the Evaluate Design report window. That table needs to be the current table (I.e., last selected) before you run the Remove.