He also noted that, for many works, more than one reasonable stemma could be postulated, suggesting that the method was not as rigorous or as scientific as its proponents had claimed.
Han lagde også mærke til, at det for mange værker var sådan, at der kunne produceres flere rimelige stemmaer, hvilket viser, at metoden ikke er så streng og videnskabelig, som dens foretalere hævder.