The transition from middle school to high school represents a significant event in the lives of adolescents, one that necessitates support from and collaboration among teachers, parents, counselors, and administrators at both educational levels. Successful transitions place particular emphasis on ninth-grade initiatives and can create one of strongest bridges from middle to high school and beyond. This report is a rolled up version of four National High School Center (NHSC) products that had been previously released as individual pieces related to one of the NHSC focus themes: transitions into high school. Included in this publication are: (1) The First Year of High School: A Quick Stats Fact Sheet (Elizabeth Williams and Scott Richman) [ED501080]; (2) Policy Brief: State and District-Level Support for Successful Transitions Into High School (Corinne Herlihy) [ED501074]; (3) Issue Brief: Toward Ensuring a Smooth Transition Into High School (Corinne Herlihy) [ED501075]; and (4) Snapshot: Managing the Transition to Ninth Grade in a Comprehensive Urban High School (Thomas J. Smith) [ED501072]. [This publication was produced by the National High School Center.]