Part I. Econometric studies: 1. Heterogeneity, omitted variable bias, and duration dependence Gary Chamberlain; 2. Social science duration analysis James J. Heckman and Burton Singer; 3. Interpreting empirical models of labor supply in an intertemporal framework with uncertainty Thomas E. MaCurdy; 4. Alternative methods for evaluating the impact of interventions James J. Heckman and Richard Robb, Jr.; Part II. Statistical studies: 5. Weighting, misclassification, and other issues in the analysis of survey samples of life histories Jan M. Hoerr; 6. Statistical models for longitudinal labor market data based on counting processes Per Kragh Andersen; 7. Assessing qualitative features of longitudinal data Haling Frydman and Burton Singer; Part III. Sociometric studies: 8. Effects of labor market structure on job shift patterns Nancy Brandon Tuma; 9.School enrollment, military enlistment, and the transition to work: implications for the age pattern of employment Robert D. Mare and Christopher Winship.