Part I: Methodological Aspects J.J. McArdle, Exploratory Data Mining Using Decision Trees in the Behavioral Sciences. G. Ritschard, CHAID and Earlier Supervised Tree Methods. J.Kopf, T. Augustin, C. Strobl, The potential of model-based recursive partitioning in the social sciences –Revisiting Ockham's Razor. A.M. Brandmaier, Timo von Oertzen, J.J. McArdle, U. Lindenberger, Exploratory Data Mining with Structural Equation Model Trees. G. Ritschard, F. Losa, P.Origoni, Validating Tree Descriptions of Women’s Labor Participation with Deviance-based Criteria. G.A. Marcoulides, W.Leite, Exploratory Data Mining Algorithms for Conducting Searches in Structural Equation Modeling: A Comparison of Some Fit Criteria. K.J. Grimm, N. Ram, M. P. Shiyko, L. L. Lo, A Simulation Study of the Ability of Growth Mixture Models to Uncover Growth Heterogeneity. R. Piccarreta, C.H. Elzinga, Mining for Association between Life Course Domains. G.Ritschard, R. Bürgin, M. Studer, Exploratory Mining of Life Event Histories. Part II: Applications C.A. Prescott, Clinical versus Statistical Prediction of Zygosity in Adult Twin Pairs: An Application of Classification Trees. J.J. McArdle, Dealing with Longitudinal Attrition Using Logistic Regression and Decision Tree Analyses. J.J. McArdle, Adaptive Testing of the Number Series Test Using Standard Approaches and a New Decision Tree Analysis Approach. T. S. Paskus, Using EDM to Identify Academic Risk among College Student-Athletes in the United States. S. B. Scott, B. R. Whitehead, C. S. Bergeman, and L. Pitzer, Understanding Global Perceptions of Stress in Adulthood through Tree-Based Exploratory Data Mining. P. Ghisletta, Recursive Partitioning to Study Terminal Decline in the Berlin Aging Study. Y. Zhou, K.M. Kadlec, J. J. McArdle, Predicting Mortality from Demographics and Specific Cognitive Abilities in the Hawaii Family Study of Cognition. K. F. Widaman, K.J. Grimm, Exploratory Analysis of Effects of Prenatal Risk Factors on Intelligence in Children of Mothers with Phenylketonuria.