Rules of thumb, from Holocene to Anthropocene

This article reviews how simple heuristics – ‘rules of thumb’ – have guided human adaptation and the evolution of complex cultures. First, we argue that rules of thumb have been important catalysts for the evolution of human knowledge systems in the Holocene past. Through a variety of examples and case studies, we discuss how human cultures have used simple heuristics in domains as diverse as foraging, agriculture, social learning, moral and legal judgement and technological development. We emphasise how rules of thumb are convenient units for cultural transmission, and how they can facilitate efficient decision making by making use of recurrent environmental features. Second, we caution that as Anthropocene environments rapidly change, many traditional heuristic problem-solving strategies will face challenges due to cultural evolutionary mismatch. Old rules may not function in new environments, creating potential challenges for traditional (ecological) knowledge.