This quantitative study examined the impact of professional learning communities (PLCs) implementing a "Focus on Learning" in a Title I school in north central Georgia. The purpose of this study was to determine the impact PLCs can have on student growth and achievement in fourth and fifth-grade mathematics, once teachers spend time identifying essential standards for their respective grade level. The researcher conducted this study during the first year of implementation, so the findings will be used to identify ways to build and improve PLCs at their school in order to increase student growth and achievement in mathematics. [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.]