Library of Congress Cataloging-in-Publication Data

p. cm. Includes bibliographical references and index. ISBN 0-87355-256-3 1. Science—Study and teaching—Methodology. 2. Science teachers—Training of. I. Yager, Robert Q181.E83 2005 507'.11—dc22 2004030525 NSTA is committed to publishing quality materials that promote the best in inquiry-based science education. However, conditions of actual use may vary and the safety procedures and practices described in this book are intended to serve only as a guide. Additional precautionary measures may be required. NSTA and the author(s) do not warrant or represent that the procedure and practices in this book meet any safety code or standard or federal, state, or local regulations. NSTA and the author(s) disclaim any liability for personal injury or damage to property arising out of or relating to the use of this book including any recommendations, instructions, or materials contained therein. Permission is granted in advance for photocopying brief excerpts for one-time use in a classroom or workshop.