In 179 b.c. the censors M. Aemilius Lepidus and M. Fulvius Nobilior brought about a reform in the voting. The only evidence for this is a single sentence in Livy (40.51.9):
mutarunt suffragia regionatimque generibus hominum causisque et quaestibus tribus discripserunt
The meaning of these words has often been discussed but never in a fully systematic manner. Further, the attempts to discover their meaning have always been made in an effort to throw light upon some other problem. They are thus transported into the historical context in question, such as the vicissitudes of the freedman vote or the reforms of the comitia centuriata. Yet the formulaic nature of the sentence and its virtual independence from its immediate context make it essential to examine it in its own right in order objectively to establish its meaning. Only then should the question of historical context be considered. The purpose here is to provide a systematic analysis of each element in this sentence. If the results of this are accepted it will become apparent that Livy 40.51.9 relates to central questions concerning the census and the centuriate assembly.
As it stands the sentence is entirely divorced from what precedes and follows it, with the exception of the subject, the censors. Not only is there nothing in the surrounding context to explain it; there is nothing remotely comparable anywhere else in Livy. This, together with the precision of the language, the institutional content, and the formal and formulaic sound of the whole, suggests that Livy has either lifted the sentence out of an official document or is using the terminology characteristic of such documents.