Behavioral and Brain Sciences

Open Peer Commentary

Rationality, logic, and fast and frugal heuristics

José Luis Bermúdez a1
a1 Department of Philosophy, University of Stirling, Stirling FK9 4LA, Scotland


Gigerenzer and his co-workers make some bold and striking claims about the relation between the fast and frugal heuristics discussed in their book and the traditional norms of rationality provided by deductive logic and probability theory. We are told, for example, that fast and frugal heuristics such as “Take the Best” replace “the multiple coherence criteria stemming from the laws of logic and probability with multiple correspondence criteria relating to real-world decision performance.” This commentary explores just how we should interpret this proposed replacement of logic and probability theory by fast and frugal heuristics.