Gerd Giger-Renser: Sometimes heuristics are dangerous and sometimes it's hard to know where to find the heuristic or the first thing to put in that fast infragal tree. The important question is to use them in the right situation, for instance, in situations of uncertainty. He says we also should not forget that analytic methods can lead to excellent results but also to total failures. Rich Goyette: We have to understand its limitations otherwise it becomes the equivalent of a religion.