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Under the WARN Act, employees who work fewer than 20 hours per week are considered part-time and are excluded from the 50-employee threshold required to trigger WARN Act notices. Official Extract:"Part-time employees (those who work fewer than 20 hours per week) are excluded when determining whether an employer meets the 100-employee threshold under the WARN Act."(Source: HRCI PHR Content Outline 2024–2025, Employee and Labor Relations Section, WARN Act Compliance)