Confluence by Atlassian has worked out great for me in the past. You can track changes, control rights to edit (and more) and take advantage of lots of features. It also integrates with other Atlassian tools. Let me know if you'd like further info or details on my past implementations.
Bookkeeping and Admin roles are completely different, if a person knows debita and credits doesn't mean that he/she is a good bookkeeper, sometimes there are situations where you need expert advise which an experienced bookkeeper can provide because they are experienced and skilled. Sitting on t...