The purpose of this assessment probe is to elicit students’ ideas about conductors and insulators of electric charge. It is designed to determine whether students can distinguish between objects that allow the charge to move (conductors) and objects that do not allow charge to move easily (insulators). The probe is best used with middle and high school students and if materials are available, consider demonstrating the probe scenario. A materials list, teacher notes, standards, assessment, safety notes, and references are provided. This book selection also includes the Table of Contents, Preface, Acknowledgments, About the Authors, Introduction, and Index.