Effective supervision models guide the supervisory relationship and supervisory tasks leading to reflective and purposeful practice. The Developmental/Ecological/Problem-Solving (DEP) Model provides a contemporary framework for supervision specific to school psychology. Designed for the school psychology internship, the DEP Model is also applicable to all pre-service and advanced field-based training, as well as career-long continuing professional development. The Developmental domain initiates training at the functioning skill level of the supervisee and progresses toward independent competency. The Ecological domain addresses the multiple systemic contexts that influence school psychology practice and prepares the intern to intervene within both individual and systemic contexts. The Problem-Solving domain focuses on the application of data-based decision making and evidence-based interventions to the full range of school psychology activities. It provides a systematic schema to address student, family, and school needs. C 2014 Wiley Periodicals, Inc.Rather than merely assuming that competent practitioners are automatically effective supervisors, the field of clinical supervision has begun to examine the specific factors that contribute to successful supervisory experiences (Harvey & Struzziero, 2008). Domains being examined include organizational structures such as pre-training skill assessments and goal setting, formal contracts, advance planning for the content and process of supervision, and accountable recordkeeping; the character of the supervisory relationship; the utilization of multiple methods of supervision; the nature of effective feedback and evaluation; standards and methods to ensure multicultural competency; specific training for supervisees toward eventual assumption of professional supervisory roles; and attention to legal and ethical requirements, including those developed by state psychology licensing boards, the American Psychological Association (APA), and professional organizations specific to school psychology, including the National Association of School Psychologists (NASP, 2010b) and the Council of Directors of School Psychology Programs (2012).To integrate these diverse factors into a framework that can guide supervisors in the day-to-day provision of effective supervision, it is necessary to formulate a coherent supervisory model that provides an overall conceptual organization of the supervisory process. A supervisory model grounds supervision in reflective and purposeful practice. A comprehensive model strives to conceptualize, organize, and execute supervisory tasks and functions in a manner that links theory, emerging research, and practice. Although this overarching model guides supervisory practice, it must be firmly grounded in the profession's current understanding of best practices within school psychology. When the formulation of this organizing model is shared with the trainee, it provides a transparent Correspondence to: