The purpose of this dissertation was to conduct a study that explores the differences in self-efficacy beliefs among specific teacher subgroups within the elementary school environment. This quantitative study searches for the differences in self-efficacy beliefs among teachers who instruct mandated state assessment subjects and those who do not. In addition, this study also attempts to search for differences in self-efficacy beliefs among elementary general education teachers and elementary specialists. This study utilizes Anita Hoy's Teacher Sense of Self- Efficacy Scale (TSES) to find the self-efficacy differences in three particular domains: classroom management, student engagement, and instructional strategies. This study will exercise the Mann-Whitney-Wilcoxon (MWW) test to analyze the results of the TSES. This method analyzes central tendency differences across two populations and is the benchmark test for non-parametric statistical analysis. Moreover, the goal of this dissertation is to inform educational leaders of the possible repercussions state-testing has on teachers who administer these high-stakes assessments. [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://www.proquest.com.bibliotheek.ehb.be/en-US/products/dissertations/individuals.shtml.]