Compare Use Cases
Learning objective: Compare cases on the same dimensions, with evidence quality and confidence made explicit.
When comparing multiple Use Cases, they must be compared on the same set of dimensions (Value, Feasibility, Readiness, Risk) one by one, rather than each case being judged by its own different standard. Each dimension's evidence quality and confidence level must also be labeled: is this judgment backed by data, or is it a pure guess? Different confidence levels mean different reliability in the comparison.
| Field | Meaning |
|---|---|
| Dimension judgment | The assessment on each of Value/Feasibility/Readiness/Risk |
| Evidence confidence | Is this judgment observed/data-backed or estimated/a guess? |
Comparison: Use Case A: Value high (data-backed), Feasibility medium (estimated, unverified), Risk low. Use Case B: Value medium (estimated), Feasibility high (data-backed), Risk medium. Since A's Value judgment carries more confidence than B's, A may be worth prioritizing for validation even if the other dimensions are close.
- High confidence (data-backed): a judgment supported by system logs, formal statistics, or repeated observation.
- Medium confidence (partially verified): supported by some data or a small sample, but not yet checked broadly.
- Low confidence (estimated/guess): mainly a single interviewee's impression or guess, with no concrete data behind it.
- When two cases score close on a dimension, trust the judgment with higher confidence first, rather than simply averaging them.
Expanding to three candidates: Use Case A (Value high/high confidence, Feasibility medium/low confidence, Risk low/high confidence), Use Case B (Value medium/high confidence, Feasibility high/high confidence, Risk medium/medium confidence), Use Case C (Value high/low confidence, Feasibility high/low confidence, Risk low/low confidence). C looks good on the surface across all three dimensions, but every number is a low-confidence estimate, so it may need a short follow-up interview to gather evidence before it goes on the priority list, rather than being ranked on guesses alone.
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When comparing two Use Cases, which approach is most correct?