The present paper is focused on proposing a positive solution in regard to HEMA reconstruction methodology. Firstly, it starts by identifying main factors behind difficulties in communicating, validating, and evaluating competing interpretations (or motion reconstructions) among different scholars and practitioners. Then, principles of the set theory as applied to the humanities are presented and explained through examples related to the HEMA studies. This is followed by a description of a proposed methodological framework, called the Set-theoretic Method, which has been devised so as to be applicable on its own to the whole process of interpretation (motion and tactical reconstruction) or as a supplement to the previously published ADVISE method, where it acts as a bias-reducing procedure, especially during comparative stage (i.e. the ‘External Input’ stage in ADVISE). Finally, the method is illustrated with a case study – a comparative analysis of the Zornhaw glosses in the ‘Codex Döbringer’, ‘Codex Danzig’, and ‘Codex Ringeck’ followed by exploration of ‘Flos Duellatorum’ by Fiore de’i Liberi in search for an analogy for Zornhaw.
Keywords: research methodology; fight books; set theory; reconstruction; interpretation.