A managed set of people and other assigned resources that delivers one or more products or services to a customer or end user. (See also “project.”)
A work group can be any organizational entity with a defined purpose, whether or not that entity appears on an organization chart. Work groups can appear at any level of an organization, can contain other work groups, and can span organizational boundaries.
A work group together with its work can be considered the same as a project if it has an intentionally limited lifetime.