Phi Delta Kappan 92 (8): 20-24. http://mcpsonline.org/images/8/88/21CC2011_ Requiring_Collaboration.pdf.Kennedy, A., Deuel, A., Nelson, T. H., & Slavit, D. (2011). Requiring collaboration or distributing leadership. Phi Delta Kappan, 92(8), 20-24....