This book is designed for high school teachers and contains tools to guide teaching, professional development, assessment, program and curriculum, and interactions with the education system working towards the vision of the National Science Education Standards. The first three and last two chapters discuss the Standards that apply to all K-12 teachers: (1) Teaching; (2) Professional Development; (3) Assessment; (4) Program; and (5) System. Each chapter contains a list of pertinent articles, a list of the Standards, and a chart highlighting the shifts in emphasis envisioned by the Standards. The fourth chapter is devoted to the science content outlined in the Standards for students in grades 9-12 and is clustered into three sections: (1) Physical Science; (2) Life Science; and (3) Earth and Space Science. Examples of inquiry, science and technology, personal and social perspectives, and history and nature of science are included for each discipline. Also included are vignettes from exemplary programs and resources for more information. Appendices include the National Science Education Standards; designing high school science facilities; and information about an optional CD-ROM that accompanies "Pathways to the Science Standards." (JRH)