The certification mark, as used by persons authorized by the certifier, certifies that these persons, who are performing the services identified above, have demonstrated satisfactory, advanced professional knowledge in the field of arboriculture, including: proper plant and tree care; identifying, planting, maintaining, and treating plants and trees; tree removal; tree climbing and corresponding rigging; knot tying and safety procedures, in accordance with the requirements established by the certifier, including the: satisfaction of professional occupational eligibility requirements; successful completion of a comprehensive knowledge and skills examination; and continuing education requirements.