Each DSpace service is comprised of Communities – groups that contribute content to DSpace – and Communities in turn each have Collections, which contain the content items, or files. In a university environment, for example, Communities might be departments, labs, research centers, schools, or some other administrative unit within an institution. Communities determine their own content guidelines and decide who has access to the community's contributions. An administrator on the DSpace team, usually the DSpace User Support Manager, works with the head of a community to set up workflows for content to be approved, edited, tagged with metadata, etc. Collections belong to a community or multiple communities (for example, research collaborations between two communities may result in a shared collection) and house the individual content items and files.