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# Specification Quality Checklist: Block Drag Detection

**Purpose**: Validate specification completeness and quality before proceeding to planning
**Created**: 2026-01-18
**Feature**: [spec.md](../spec.md)

## Content Quality

- [x] No implementation details (languages, frameworks, APIs)
- [x] Focused on user value and business needs
- [x] Written for non-technical stakeholders
- [x] All mandatory sections completed

## Requirement Completeness

- [x] No [NEEDS CLARIFICATION] markers remain
- [x] Requirements are testable and unambiguous
- [x] Success criteria are measurable
- [x] Success criteria are technology-agnostic (no implementation details)
- [x] All acceptance scenarios are defined
- [x] Edge cases are identified
- [x] Scope is clearly bounded
- [x] Dependencies and assumptions identified

## Feature Readiness

- [x] All functional requirements have clear acceptance criteria
- [x] User scenarios cover primary flows
- [x] Feature meets measurable outcomes defined in Success Criteria
- [x] No implementation details leak into specification

## Validation Results

**Status**: ✅ PASSED

All checklist items passed on first validation. The specification is complete, clear, and ready for planning.

### Strengths

1. **Clear user stories**: Three prioritized stories (P1-P3) that are independently testable
2. **Comprehensive requirements**: 10 functional requirements that are testable and unambiguous
3. **Measurable success criteria**: All 5 success criteria are quantifiable and technology-agnostic
4. **Edge cases covered**: 5 edge cases identified with expected behavior documented
5. **Well-defined entities**: Block and Drag Interaction entities clearly described
6. **Explicit assumptions**: 6 assumptions documented regarding threshold measurement, distance calculation, and existing system capabilities

### Notes

- Specification successfully avoids implementation details while being specific about behavior (e.g., "5-pixel threshold" and "Euclidean distance" are behavioral specifications, not implementation constraints)
- The one potential concern is FR-008 which specifies the Euclidean distance formula - this is borderline implementation detail, but it's included in the Assumptions section as well, indicating it's a behavioral specification for consistency rather than a technical mandate
- Success criteria SC-001 and SC-002 include specific latency targets (50ms, 16ms) which are measurable and appropriate for interactive UI features
- All three user stories are truly independent and deliver value on their own, meeting the MVP requirement
