The method presented here relies upon text-genealogical principles inspired by the Lachmannian or neo–Lachmannian tradition, and attempts to computerise them, following and extending the procedure first proposed by E. Poole in the 70’s. More than the application of computerised methods to philology, this method seeks to extend philology through the aid of the computer. It favours interaction between philologist and computer, and requires the former’s critical judgement at some points. After a careful selection of variant locations, needed to eliminate contamination and polygenesis (the two major factors that could impede the elaboration of a stemma), we then proceed to produce a stemma that is, at least at first, a simplification. The method is applied to two traditions: the artificial Parzival and the Bestiaires d’Amors by Richart de Fournival. The results obtained on the second are close to the hypotheses of C. Segre and J. Holmberg / G. B. Speroni.