This qualitative case study focused on the effectiveness of leadership coaching and its impact on school principals' professional growth. Through an in-depth interview process with eight principals, perceptions regarding their leadership or performance coach's effectiveness were explored using the CLEAR Coaching Model as a conceptual framework. Participants shared experiences through participation in the School Support Program hosted by the Arkansas Leadership Academy. Five significant themes emerged from this study: 1) the coaching relationship impacts effectiveness, 2) a working alliance is needed to ensure desired outcomes, 3) understanding school culture and current reality are necessary before coaching can begin, 4) the coach's ability to ask questions influences the perception of success in the coaching experience, and 5) professional learning experiences with the addition of a coach are more successful. [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.]