Stakeholder
Any individual, group, or organization that can place a claim on or influence the organization's resources or outputs, is affected by those outputs, or has an interest in or expectation of the organization (Defense Information Systems Agency Performance Planning Guidance for Fiscal Year 1998, p. F-5). All the people affected by the design and use of an IT (or other) system or application. Typically this superset includes many subsets such as developers, customers, users, CXOs, financiers, testers, maintainers, and others. Such people have a stake in the success of the product or program. Their differing perspectives, however, often result in conflicting requirements, value judgments, and political stances. "Where you stand depends on where you sit."