In an embodiment of a method of evaluating robustness of a proposed
solution to a constraint problem, operational output data for at least
first and second modified versions of the proposed solution is generated.
The first modified version has at least one control variable of the
proposed solution perturbed in a first direction and the second modified
version has the at least one control variable of the proposed solution
perturbed in a second direction. At least a portion of the generated
operation output data is then presented such as on a graphical user
interface.