Understanding the "Change Generating Rules" tab of the factorial screening platform

[#1]

Hi everybody,

I am setting up a factorial screening design and want to adjust the 2FI aliasing so it fits my anticipated interactions.

What I would like is to have [Perform dialysis]x[Centrifugation % of max] aliased with [Imidazol]x[Covered surface area]

My problem is I cant get my head around the logic of the "Change Generating Rule" tab during design generation.
I read the help topic but I am still lost. 

How do I interpret that weird table. Everything I do feels random and half of the time I do end up with a block effect aliased with a main effect.

cheers ben

[#2]

Ha, and I thought it was just me (though I don't consider myself an expert!). Similar to Victor, I have to "play around" with the configuration and keep checking the aliasing to get what I want.

Curious, why do you want 4 blocks?  Certainly you are not interested in cubic block effects. What is your purpose of blocking?