Hi Victor,
Sorry I am not clear, so I try to explain differently.
1. If X13 is chosen, none of the X14, X15, and X16 can be selected: what I meant here is that the engineer has two power supplies: one associated with X13 and the other one with X14, X15 and X16. He can only choose one power supply per experiment. If he chooses power supply 1, then he only has X13, all other variables in place (excluding X13, X14, X15). If he chooses power supply 2 then X14, X15 and X16 come into play and X13 is no longer a variable.
2. "Further X14*X15 <= 1200": I should have mentioned that X14 is in percentage ... my apologies
3. "Finally X13/X10 must be whole number": here the interest is in the X13 and X10, and the engineer is requesting that we design the experiment keeping this in mind, so both of them need to be in the design.
In regards to item 1, I thought maybe one approach is just having two designs, one for each power supply. This may not be the best design and the reason I am seeking advice.
Thanks again for your time