The Center for the Advancement of Collaborative Strategies in Health has developed ideas and tools to enhance partnerships, including an adaptable tool to measure strength and cohesion in a given group. The Partnership Self-Assessment tool, scoring instructions and a coordinator's guide are all freely available for download, along with a published article on the concepts underlying synergy.
From the Center for the Advancement of Collaborative Strategies in Health, Division of Public Health, New York Academy of Medicine.  http://partnershiptool.net/