This volume discusses the difference between how groups operate versus how individuals behave and is the second title in a series that introduces students and researchers to the fundamentals of important and far-reaching topics in sociology, using easy-to-understand language. This work includes categories such as: Social Movements & Collective Behavior; Stratification & Class in the U.S.; Social Interaction in Groups & Organizations; and Sociology of Religion. Entries are arranged A to Z by section, making it easy to find the topic of interest. Each entry includes the following: Abstract giving a brief introduction to the topic; Overview that presents key terms and concepts; Clear, concise presentation of the topic, including a discussion of applications and issues; Definitions of key Terms & Concepts; and Bibliography for further reading. Back matter contains a thorough and valuable index. Essays are written for a varied audience and include a list of entries for further reading.<\\P>