The 15 high school models that make up this monograph were chosen by the advisory board as the best examples of programs: each has had a clear, positive impact on student science learning. The four goals for K–12 science encompass preparing students who: 1. experience the richness and excitement of knowing about and understanding the natural world; 2. use appropriate scientific processes and principles in making personal decisions; 3. engage intelligently in public discourse and debate about matters of scientific and technological concern; and 4. increase their economic productivity through the use of the knowledge, understanding, and skills of the scientifically literate person in their careers.