Supervision in School Psychology: The Developmental, Ecological, Problem-solving (DEP) Model presents the seminal model for clinical supervision specific to the diverse competencies required by school psychologists and associated professionals in school-based settings. It is widely used in graduate classrooms, by field and university supervisors, and in professional development and credentialing programs teaching best practices in supervision. Supervision Case Studies for School Psychologists: The DEP Model in Action illustrates the research-into-practice value of the DEP Model across a wide array of case examples. Expert field- and university-based supervisors present diverse case studies that illustrate the application of best practices in supervision to routine and complex supervisory challenges. Cases explore the full range of supervisory and clinical practice: supervision of academic and behavioral assessment, intervention, and consultation; strategies for teaching program development, systems change, social justice advocacy skills and fostering diversity and culturally responsive practice; supporting supervisee self-care; and problem-solving ethical dilemmas. Complex challenges of addressing supervisee skill deficits through deliberate practice and structured remediation plans are illustrated. Case examples include supervision of both preservice and credentialed school psychologists and illustrations of district-wide professional development programming based on DEP principles. Supervision Case Studies for School Psychologists: The DEP Model in Action integrates best practices in supervision and service delivery.