Project PROPEL (Program Reorganization Promoting Excellence Through Language) is a program in content area instruction for limited English speaking (LEP) high school students, developed at the International High School of LaGuardia Community College (New York). The handbook is designed to assist teachers, administrators, and policymakers attempting to reorganize their programs to serve this population. Introductory sections describe the International High School program, present its mission statement and educational philosophy, and offer general information on content-based English as a Second Language, strategies for teaching LEP students, collaborative learning, interdisciplinary study, and alternative methods of assessment for students and staff. Subsequent sections provide more detailed information on the objectives and design three programs: the Motion Program, a set of courses exploring the concept of motion from the perspectives of several disciplines, including literature, mathematics, physics, and physical education; Beginnings, a full-day interdisciplinary program stressing linguistic and cognitive development; and a personal and career development program, a 3-year experiential learning sequence incorporating linguistic skill development, multiple learning contexts, and career education. Notes for teachers and program developers and sample class activities are contained in each of these sections. Criteria for program adoption and a list of Project PROPEL publications are appended. (MSE)