Written by well known and highly respected researchers in the field, this text is the first of its kind: A single volume text designed to provide a broad overview of this important research area. his text is organized in a way that answers the most commonly asked questions about helping behavior, then in its final chapter asks the students to think critically about what they have learned. This final chapter poses a series of new questions that will demonstrate the dynamic and evolving nature of this field of study. These questions were suggested by gaps in research and suggestions by top researchers in the field who responded to requests for what they thought were the most important unanswered questions. Because the text is truly the result of the joint efforts of four major researchers, the treatment of all topics is balanced and even-handed; there is no ideological point of view taken.