The Nazi state relied heavily on anthropometric measurements to determine racial affiliation. In particular, a select group of racial experts from the SS Race and Settlement Main Office (RuSHA) developed methods for diagnosing the different racial components of individuals, according to certain physical markers. Despite the extensive existent literature on Nazi racial policies, we still do not know how the SS racial experts practically determined one’s racial affiliation. The proposed project aims to explore this theme by scanning and analyzing hundreds of thousands of ‘racial-cards’ used by SS experts, and then retrieving the data from these cards, which, due to their vast numbers, cannot be done manually. The goal is therefore, first, to develop specifically customized digital technology (i.e., software) to extract data from these archival sources. Once retrieved, these data will help us uncover the various components that determined the process of racial selection – including entrenched racial perceptions, social stigmas, ideological biases, utilitarian considerations, as well as more mundane circumstances related to the timing of the examination (e.g., time of the day), bureaucratization, routinization, and the changing circumstances of the war. Our findings will open a window onto the intricate links between measurement, perception, social and ideological biases, and sorting methods, as these interacted during a most turbulent and fateful historical period in European history. The study is projected to have pertinent repercussions and lessons also for the present era, when governments and corporates throughout the world promote the use of facial recognition software, AI and racial profiling for sorting individuals.