Some examples of open bargaining:
Concord, Massachusetts: http://www.labornotes.org/2016/02/seven-steps-opening-bargaining , http://concord.wickedlocal.com/article/20151119/NEWS/151115718
St Paul, Minnesota: St Paul teachers fight for their students learning conditions
Nation-wide: http://america.aljazeera.com/opinions/2016/2/why-teachers-are-striking.html