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Relevance 9/10Quality and QABeginner5 min read
Edge Case
An edge case is a rare but valid sample that stresses normal labeling rules.
Why it matters for annotators
Models often fail first on rare and ambiguous examples.
Visual mental model
Typical sample vs rare sample -> apply policy consistently.
Examples (bad vs good)
Scenario: Real annotation scenario involving Edge Case
Bad: Labeling quickly without applying project rubric.
Good: Applying rubric criteria, documenting rationale, and escalating uncertainty.
Common mistakes
- Skipping guideline details for edge cases.
- Applying inconsistent criteria across similar samples.
- Avoiding escalation even when uncertain.
Submission checklist
- Read the latest guideline update before each batch.
- Apply rubric dimensions explicitly in each decision.
- Escalate ambiguous items with concise rationale.