where decision variables are the missile system alternatives.
xj ¼ 1 if the jth alternative is selected;
0 otherwise;
; j ¼ 1; 2; ... ; 6:
The model also includes the following hard constraint:
X6
j¼1
xj ¼ 1
The objective function is to minimize the total weighted deviations
from the goals that satisfy the above constraints. It can be expressed
as follows: