Both methods allow the grouping of works by the same
author under one notation and ensure the alphabetical sequence of
authors within a class of documents. Each uses the principle of
decimal ordering and they allow unlimited interpolation of new
authors. Equally, for both systems to work one has to control the
shelflist catalogue in order to verify whether the author already
exists in the class, under which code and which codes are free for
use. But most importantly both methods require an additional set
of guidelines and rules to cope with the versatile nature of a
document’s authorship, embodiments or manifestations (Slavic,
1997).