Abstract
Cognitive engineering is at an early stage of evolution. In order for it to flourish and mature, we need a diverse conceptual gene pool of alternative proposals that can feed into a natural selection process. Dowell and Long provide one such proposal, and in this commentary, I describe another based on the conceptual genotype originating from Riso National Laboratory in Roskilde, Denmark since the 1960s. Only by generating and critically testing the comparative fitness of these and other alternative proposals will we have a cumulative, mature, and thriving discipline of cognitive engineering.