2004, Conor Fahy, "Old and New in Italian Textual Criticism", page 404 in Raimonda Modiano, Leroy Searle, & Peter L. Shillingsburg (eds.), Voice, Text, Hypertext: Emerging Practices in Textual StudiesIn other words, they must carry out an operation similar to the collations required by Lachmannian stemmatics, after which they must make a critical (i.e., subjective) choice. And, when constituting the text, they do not just slavishly copy their source, obvious errors included; their editions always contain an element of interpretation.