Sensitivity Analysis Methods

Hi All,

Thanks for the amazing software uqlab. Please I will like clarification on the global sensitivity methods. More Particularly, Borgonovo and Sobol; is there any advantage of the use of one over another? Also considering Sobol indices, say given a function Y= X1 +X2 ( both independent random variables) where the Total sobol indices is X1=0.9 AND X2=0.9 how can this outcome be interpreted with respect to the output response Y?