A coalition is an organization of many different groups and individuals that come together for a common purpose. The idea is that the coalition will become more than the sum of its parts.
Coalitions usually function a little differently than partnerships.
Due to the fact that many different groups are present there is a need to focus on what is common between the groups. Problems often occur when groups bring too much of their own agendas to the coalition or when the differences between groups on other issues is dwelt upon, instead of the similarities. Coalitions can be run in a non-hierarchical manner where each group, or combinations of groups are represented in some sort of decision making body. Often times individuals will have a mandate from their own group to commit the group to participate in a certain manner. Coalitions are useful for showing broad based support and concern on issues of sustainability.