 Rugg's other work is multidisciplinary, including theoretical archaeology and teaching methods.Rugg used an informal version of the Verifier method to re-assess previous work on the Voynich manuscript, a manuscript widely believed to be a ciphertext based on a code which had resisted decipherment since the manuscript's rediscovery by Wilfrid Voynich in 1912.Previous research had concluded that the manuscript contained linguistic features too complex to be readily explicable as a hoax, and too strange to be explicable as a transliteration of an unidentified language, leaving an uncracked cipher as the only realistic explanation.