The product is a textbook titled “Principles and Practice of Structural Equation Modeling, Fourth Edition” by author Rex B. K Line. Published by Guilford Publications in 2015, this revised edition falls under the series “Methodology in the Social Sciences Ser.” The book covers subjects in psychology, mathematics, medical, and social science, with a focus on probability & statistics, multivariate analysis, research, psychiatry, and general statistics. This comprehensive textbook is 534 pages long and is suitable for students and professionals interested in the principles and practice of structural equation modeling.