 Philosophical discussion over measuring heritability has arisen mostly from the use of \(h_b^2\) measures in behavioral genetics and psychology. Much of this discussion takes off from a paper by Lewontin (1974) in which he argues that the analysis of variance cannot provide us with answers to questions about how much genes contribute to variance in a given trait. Before we turn to this and related discussions, we provide more detail on how heritability is measured in humans.