Several months ago, word got to our faculty that a group of parents was working to move our school's start time (and hence finish time) 30 minutes later in the day. They did a fairly decent job of poring over research and late last year (month?) gave a presentation to the faculty. The presentation was clearly biased towards a later start time, but that was to be expected since that's what they wanted. They anticipated many challenges to their proposal and addressed each of them. A couple of "community forums" were held after school hours so that interested parties could raise their points, but they were sparsely attended.
After that first presentation to the teachers, a straw poll showed faculty support for moving the start time to be about 60%.
In mid-January the teachers union president came to give a presentation. He wanted to explain how making this change involved the union, the district, and their negotiation teams. He also mentioned that when making such decisions, a mere majority often isn't a good idea; he recommended a 75% majority. One of our teachers (correctly) pointed out that we couldn't get 75% of our faculty to agree on summer vacation, so the threshold was moved to only 55%. I believe this number was chosen because of the aforementioned straw poll.
Discussions about the change took place in the halls, in the staff lounges, via email, you name it. I questioned why only teachers got a vote on this, and not our administrative, clerical, custodial, or food service staffs. We took informal polls of students and parents and those, while not scientific, were overwhelmingly against the change. Some staff members thought a vote on the change was being forced on us in a time crunch. The issue was fast becoming contentious, and the vote was held.
The start time change failed, 57%-43%.