Decision Table Builder

decision-table-builder

Purpose

Translate combinational business logic into a structured decision table and derive lean but sufficient tests.

Trigger this skill when

• You need disciplined test design rather than ad hoc case generation.
• You need to justify why a test set is sufficient.
• You want a reusable artifact that can feed automation later.

Expected inputs

• business rules
• conditions
• actions or outcomes
• policy exceptions

Deliverables

• decision table
• collapsed rule set
• test scenarios
• rule completeness notes

Operating procedure

1. List the conditions and possible values that drive outcomes.
2. Enumerate or collapse rules into a clean decision table.
3. Mark impossible or forbidden combinations explicitly.
4. Derive a lean test set that covers each meaningful rule.

Quality gates

• Be explicit about infeasible, unreachable, or assumption-heavy cases.
• Prefer lean, justified test sets over exhaustive-looking noise.
• Keep expected outcomes observable and tied back to rules or logic.
• Show why each test exists, not just the test data.

Handoff targets

• pairwise-test-generator
• test-oracle-writer
• requirements-conflict-checker if present

Output style

• Be explicit about uncertainty, infeasibility, and residual risk.
• Prefer compact, explainable artifacts over bloated lists.
• Tie tests back to rules, logic, or structure.
• Make expected outcomes observable.

Failure modes to avoid

• Do not hide contradictory rules.
• Do not leave impossible combinations unmarked.
• Do not produce a giant table without pruning or explanation.

Minimum output skeleton

## Summary
## Findings
## Structured outputs
## Coverage / rationale
## Assumptions
## Open questions
## Recommended next skill