Accommodations are an integral part of a student's IEP or 504 plan; however, accommodation implementation differs by the various populations of teachers. This research study's purpose examined how the different populations of teachers implement students' accommodations and how the results could be used for professional development. This study consisted of 60 kindergarten through eighth-grade public school teachers who filled out a Microsoft Forms survey to report on their implementation of accommodations. Data results were analyzed using SPSS software to identify significant differences between the various populations of teachers. Data revealed there was a significant difference in the perception of general education teachers and special education teachers; teachers with less than 5 years of experience and five or more years of experience; teachers with a bachelor's degree only and teachers with a master's degree or higher. These findings indicate that professional development within these three target populations can be beneficial for accommodation implementation to occur with fidelity. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]