• You want team members to recognize the document as being relevant to an ongoing project.

  • You want to spread ownership and permissions across a wider collection of people. If a document is important to the success of a project, it’s a good idea for there to be people other than yourself who can control what happens on the site.

  • You want permissions to be granted on a site basis, instead of on individual documents. If people have access to the team site, then they have access to documents stored in the site.

  • Other project-related documents are already saved to the team site library, and others expect to find it there.

  • You want to create a check-in workflow that assigns the document to someone else.