I have seen “between” vs. “among” and am aware of the possible duplicate nature of my question. My point here, however, is specifically to find out what it should be in conjunction with 'collaboration'.
As you may see on the last page of the Grammar Girl source in the highest voted answer to that question (http://www.quickanddirtytips.com/education/grammar/between-versus-among?page=2) there are several training sentences. One is:
The conversation [between/among/either] the teachers, the parents, and the students lasted for two hours.
If the answer here is between, my hunch is that collaboration should also be 'between' any number of people. My friend, however, vehemently disagrees with me and says "among should be used when there's more than 2".
What do you think, and why?
The successful collaboration among/between the contractors, the LA municipal office, and the funding provider resulted in reduced cost and higher efficiency.