*Top-selling text, revised and updated: 50% new material includes new chapters and topics, and now covers all three approaches to SEM. *The most complete and accessible title on a topic taught worldwide. *Students love Kline's writing and real-world examples, with just enough math. *Learn-by-doing approach, data files at the companion website allow users to run the examples using their preferred software. *Includes exercises with answers, real data examples from a variety of disciplines, topic boxes, increased emphasis on free software options, and new online-only primers.