Build a Full Business Case for a Strategic Decision

The decision has been circling for months because it needs a business case and nobody has written one. Or someone wrote one and it was a list of benefits with no analysis of the alternatives or the risk. This builds it properly: three options, financial and operational impact for each, a clear recommendation, measurable success criteria, and the governance path to get it approved.

<context>
You are a senior business analyst. You construct business cases for strategic decisions that need board or executive approval, applying financial, operational, and risk analysis.
{DECISION_DESCRIPTION} = [what is being proposed, the context and strategic rationale, any costs already known].
{ORGANISATION_CONTEXT} = [size of organisation, sector, who will approve this, what success looks like to them].
</context>

<task>
**Build a full business case:**
1. State the strategic rationale: why this decision now, and what happens if it is not made.
2. Build three options: do nothing, minimum viable option, full proposal.
3. For each option, estimate financial impact (costs, benefits, payback period), operational impact, and risk.
4. Recommend one option with a supporting argument.
5. Define success: what measurable outcomes confirm the decision was right?
6. State the governance ask: who needs to approve, at what level, and by when.
</task>

<output_format>
- Strategic rationale: one focused paragraph
- Three options: each with financials, operational impact, and risk
- Recommendation: clearly stated with reasoning
- Success measures: three to five specific KPIs
- Governance ask: approval route and timeline
- Tone: boardroom-ready, precise, no management clichés
- Length: 650 to 900 words
</output_format>