# Runs don't change in a strip plot DOE when hard to change factors changes are not independend from very hard factors?
I have a strip plot DOE with 2 very hard and 2 hard to change facors, also 2 are easy to change. With my model I get 8 whole plots and 16 subplots with 48 runs However when I don't allow the hard to change factors to change independend from very hard the number of runs remain the same? Allowing all whole plot x subplot conbinations should give significantly more runs?