This dissertation examines the connection between the English Language Arts Professional Learning Community, data analysis, and research-based instructional strategies to improve students reading levels, as measured by the Pennsylvania Literature Keystone Exam at an Urban High School. It is a mixed-method study. Data were collected from 9th -12th grade English Language Arts teachers with an "End of Year" PLC survey, English Language Arts teacher interviews, and a review of the 2023 Pennsylvania Literature Keystones exam results. Results demonstrated that focused professional learning community activities and regular data examinations may lead to an increase the reading proficiency scores. [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.]