Arborist Certification Study Guide 2026-2027 is an independent publication and has not been authorized, sponsored, or otherwise approved by the International Society of Arboriculture (ISA), the ISA Certified Arborist® program, or any affiliated organizations or certification bodies. The term ISA Certified Arborist® is a registered trademark of the International Society of Arboriculture. All other brand names, product names, logos, and trademarks mentioned in this guide are the property of their respective owners. References to these trademarks are made for educational and informational purposes only and do not imply any affiliation with, endorsement by, or sponsorship from the respective trademark holders
