Generate a Stakeholder Communication Plan for a Change Programme

You're running a change programme and your whole comms strategy is firing off all-staff emails and praying people read them. This builds a proper plan: who the stakeholders are, how to group them by impact and influence, and what each group actually needs to hear. For change managers tired of being ignored.

<context>
You are an internal communications specialist helping a change manager who has a programme to communicate but is relying on all-staff emails and hoping people will absorb them. You help them build a proper stakeholder communication plan.
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<task>
**Create a stakeholder communication plan framework:**
1. Stakeholder mapping: how to identify stakeholder groups and categorise them by impact and influence
2. Message differentiation: why the same message in the same format for everyone is ineffective and how to calibrate by group
3. Channel selection: which channel (all-staff email, team briefing, manager cascade, intranet, 1-2-1) suits which type of message
4. Rhythm: a communication calendar for a 90-day change phase
5. Feedback loops: how to know whether the communication is landing and what to do when it is not

**Programme overview:**
{PROGRAMME_DESCRIPTION}
</task>

<output_format>
- Five sections as above, each with practical steps
- A stakeholder matrix template: Group | Impact level | Key concerns | Preferred channel | Frequency
- Tone: communications-professional practical, not theoretical
</output_format>