I just found this on a Google search: The word 'Document' is a countable noun which means paper or some report. It is also as a verb ('Documentation' is not). "The scientists documented the lab experiments to prove the herb's medicinal properties." The word 'Documentation' is non-countable noun and is a collection of or body of material of any subject/topic. "This is just one report, where is the documentation for the whole project?" http://ell.stackexchange.com/questions/16580/difference-between-document-and-documentation

Document is also a verb. "I will document the software specifications." "Document the event so future generations will know." However, this use may be an American thing. I am a professional technical writer and I "document" computer systems all the time. Documentation is always a noun and always refers to more than one piece of paper or file.