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There are plenty of practitioner-oriented resources to draw on. One recent paper on planning and carrying out these external activities presents a "stakeholder circe" framework you may find helpful: Achieving a Successful Engagement. A much simpler framing in Making Sense of Stakeholder Mapping justs just lists types of stakeholders. From the world of information technology come many potentially useful tools. Consider this detailed overview, Project Clarity through Stakeholder Analysis, which explains the rationale behind the proposed approach. Note that you can click on each image to see it more clearly. This piece should give you a sense of how stakeholder analysis is used in projects.
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