Reconstructing Combinatorial Inventions Through Design Problem Analysis

Combinatorial invention—the process by which new technologies emerge through the combination of existing ones—is central to technological evolution, yet it remains poorly understood. This paper develops a novel framework for analysing combinatorial invention by recognising its dual nature as both a design problem-solving process and a lineage-generating process. While existing approaches often treat combinatorial invention as a stochastic process mapping precursor technologies to composite ones, this framework reveals how the challenge of interfacing components generates multiple concurrent technological traditions. By identifying genuine design sub-problems—those requiring solutions that were novel, necessary, and culturally transmitted—we can reconstruct aspects of combinatorial invention processes through the phylogenetic traces their solutions left in the archaeological record. Using the invention of hafted tools by Neanderthals and their African contemporaries as an illustrative case study, I show how this framework reveals a complex, multi-tiered invention process involving functional organization, material implementation, and assembly procedures. The combinatorial invention of complex technologies should be understood not merely as producing composite technologies, but in addition as one generating a manifold of technological lineages through the solving of multiple design sub-problems, specifically traditions of interfaces between the components of the technologies. The proposed framework provides preliminary methodological grounds for reconstructing prehistoric invention processes.