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For a ready-to-use tool, here's an interactive framework: Stakeholder Analysis Worksheet from IT Toolkit. A similar worksheet, Stakeholder Mapping, from ChangingMinds.org also shows some links to a simple model of change that may be useful for you.
If you'd like to learn about the work behind one of these tools, consider this (project management stakeholder tool and its underlying rationale).
Building your own framework
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Source for this section: Schmeer, Kammi. 1999. Guidelines for Conducting a Stakeholder Analysis. November 1999. Bethesda, MD: Partnerships for Health Reform, Abt Associates Inc. Accessed September 2007 at http://info.worldbank.org/etools/docs/library/99169/CD_CC/precourse/CCFY04CDRom/Week2/4Thursday/S2EngagingStakeholders/Guidelinesforstakeholderanalysis.pdf