This applied research study seeks to improve principal capacity as instructional leaders. The need for principals to increase their instructional leadership capacity became evident with the ever-changing requirements of state accountability and student achievement. Using four elements in this study, cohort-based professional development for principals, principal PLCs, data meetings, and consultant and district administrator campus visits, the program sought to develop and grow principal leadership. Surveys, focus groups, and interviews were used in the study. The findings reveal improvement in instructional leadership capacity in the district and can provide educators with information, including an action plan, to implement instructional leadership development. [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.]