Dear all,

i know this question was asked several times, however I’m not quite sure how to solve my underlying problem. I’m writing on a seminar paper in regards to transport planing, sustainability and uncertainty.

The problem I’m working on is multi criteria optimization with uncertainty → which i try to solve by goal programming.

What I try to model atm is the goal function of disruption cost. which is defined in the paper like this.

In case you are interested in the paper, please check doi:10.3390/su6106666.

(please ignore the red lines - these were set for my modifications, because i leave out manufacturing)

So the problem now is, that “j” and “t” as well as others are set as not specified… is there a solution to this topic? 

I’d appreciate if someone could help me out.