The purpose of this assessment probe is to elicit students’ ideas about electrical interactions. It is designed to find out how students visually represent electrical interactions. The most common representation used to account for electric interactions is the use of positive and negative symbols. These symbols are used to represent the two different types of electric charge that exist in all of nature. 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.