Weight of each criteria on final outcome I have a model that prioritizes sites based on chemical concentration (of 3 chemicals), movement (high, medium, or low) and impact (high, medium, or low). The figure below illustrates the model. 

My question is what is the percent influence of each of the three categories (Chemical Concentration, Movement, and Impact) on the final outcome? Does each have a 33.3 percent influence on the outcome because each is considered equally? Or does the Chemical Concentration Category alter this because it contains its own categorization? 
 A: I don't understand exactly what you mean by weight(if you have a more "formal" definition for it, it could help) but, I think that the Chemical Concentration category has more influence on the outcome than the other two, because of two reasons.
Firstly, knowledge of the Chemical Concentration always excludes a certain outcome. If $CR$ is high($H$), the outcome can't be low($L$). If $CR$ is medium($M$), the outcome can't be $H$. And if it is $L$, the outcome can't be high. The same can't be said for knowledge of any of the other two categories.
Secondly, if $CC$ (chemical concentration) takes the values $L,M,H$ each with probability $1/3$, and $impact$ also takes the values $L,M,H$ each with probability $1/3$, and $movement$ also takes the values $L,M,H$ each with probability $1/3$, then by knowing only the:
$-$ value of $CC$ and playing smartly, you can guess the outcome correctly with probability: $\frac{1}{3}*\frac{5}{9}+\frac{1}{3}*\frac{5}{9}+\frac{1}{3}*\frac{8}{9}=\frac{2}{3}$ 
$-$ value of $impact$ and playing smartly, you can guess the outcome correctly with probability: $\frac{1}{3}*\frac{4}{9}+\frac{1}{3}*\frac{4}{9}+\frac{1}{3}*\frac{6}{9}=\frac{14}{27}<\frac{2}{3}$ 
$-$ value of $movement$ and playing smartly, you can guess the outcome correctly with probability: $\frac{1}{3}*\frac{4}{9}+\frac{1}{3}*\frac{4}{9}+\frac{1}{3}*\frac{6}{9}=\frac{14}{27}<\frac{2}{3}$
