High attrition during the first few years of teaching is a long-standing dilemma. Research findings vary somewhat according to specific studies, but it is estimated that about 30% of new teachers do not teach beyond two years, and within the first five years of teaching 40-50% leave the profession. Traditionally, discussions of new teacher induction have not considered the role of the school principal as significant (Carver, 2003). However, Brock & Grady (2001) found that beginning teachers identified the school principal as the most significant person in the school, as well as a key source of support and guidance. A recent exploratory case study of the supportive behaviors of four principals resulted in a structural framework of recommended practices (Carver, 2002); however, the importance of those behaviors in the retention of first-year teachers has not been studied. This mixed methods research study examined the relationship between principal support behaviors and the likelihood of first-year teachers remaining in the teaching profession. Q sorts, detailed questionnaires, and follow-up interviews were conducted with first-year and fifth-year teachers. Findings indicated that principal support was important to some first-year teachers in making retention decisions; additionally, specific principal behaviors that have the most influence on the likelihood of first-year teachers remaining in the profession were identified. Analysis resulted in the development of a list of 10 principal support behaviors that are most likely to influence first-year teachers to remain in teaching. These findings could prove beneficial in stemming the attrition rate of new teachers. [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/en-US/products/dissertations/individuals.shtml.]