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Stakeholders are those fine folks and organizations who are actively involved in the project or who will be affected by its outcome—in other words, people, groups, businesses, customers, and communities that have a vested interest in the project.
Stakeholders may like, love, or hate your project. Consider an organization that is hosting a project to move all their workers to a common word-processing application. Everyone within this organization must now use the same word-processing application. Your job, as the project manager, is to see that it happens.