This qualitative comparative case study focused on two groups of teacher-leaders: one that participated in teacher leadership development training and one group that has not. The setting for this study was looking at two groups of instructional specialist in a large suburban district. Getzels-Guba Social Systems Models is the theoretical framework used to frame the results of this study. Findings suggested that teacher leadership development training influenced how teacher leaders who participated in training reacted to barriers and interacted with the teachers they serve within this case study. [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.]