legendtkl Big Bang 80/20: Specification Closure
Core Concept
Specification closure is the gate before EPIC 9 fan-out.
No implementation begins without closure verification.
Closure Checklist
A specification is closed when:
- All inputs characterized (domain, constraints, edge cases)
- All outputs specified (behavior, invariants, success criteria)
- All errors enumerated (what happens when things fail)
- All ambiguities resolved (no TBD, TODO, undefined)
- All user stories have acceptance scenarios
- SHACL validation passes
Quick Validation
# Check for incomplete markers
grep -r "TBD\|TODO\|FIXME\|undefined" .specify/
# Validate SHACL conformance
cargo make speckit-validate
Reference
See CLAUDE.md sections:
- Three Paradigms (Big Bang 80/20)
- When to Use EPIC 9
- Agents: bb80-specification-validator