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DOE questionI am hoping that someone here can help me with this question about the use of blocking variable in DOE custom design. I have six factors, three at 3 levels, two at 2 levels, and one blocking variable in 2 levels. I am trying to figure out how to enter the information on the blocking variable in the custom design framework. When I try to add a factor as a block, it asks for the number of runs. It is not clear to me exactly what it means. If I choose the number of runs as 108 (3x3x3x2x2) then I get two blocks, but very large number of runs; but by choosing smaller number of runs, it give me more than two blocks. There is also a check box for grouping runs in blocks, and I was wondering if that is what I should be using.

I would appreciate any help in this matter. Thanks in advance.