As publisher of the Guide for Plant Appraisal, 10th Edition (Guide), ISA has been cataloging feedback and comments received as appraisers have been field testing the approaches and forms included in the Guide. The Guide is published by ISA under the agreement of the organizations in the Council of Landscape & Tree Appraisers (CTLA). These organizations are: AmericanHort, American Society of Consulting Arborists, American Society of Landscape Architects, Association of Consulting Foresters of America, International Society of Arboriculture (ISA), National Association of Landscape Professionals and the Tree Care Industry Association.

In the most recent printing, the CTLA approved the revision to two forms (Repair Method: Direct Cost Technique and Functional Replacement Method: Trunk Formula Technique) included in the Guide. The Corrigendum document available for download on the ISA webstore includes all updates and revisions to date. Also available on the ISA site are downloadable and fillable versions of all the forms included in the Guide.