1. Regular causes: Inefficiency, dishonesty, drunkenness, carelessness, and violation of rules.
2. Irregular cause: Accident, insubordination, personal conduct, lack of cleanliness, infraction of rules, destructive negligence, wastefulness, and physical unfitness.
3. Other causes: Lack of cooperation, laziness, tardiness in starting work, frequent absences without leave, lack of specific skill, adverse attitude towards the organization.