Contents: Part I: Introduction. Preface. L.M. Casper, S.L. Hofferth, Playing Catch-Up: Improving Data and Measures for Family Research. Part II: Marriage and Cohabitation. J.T. Knab, S. McLanahan, Measuring Cohabitation: Does How, When, and Who You Ask Matter? M.S. Pollard, K.M.Harris, Measuring Cohabitation in Add Health. P.R. Amato, Studying Marriage and Commitment With Survey Data. A.J. Hawkins, B.J. Fowers, J.S. Carroll, C. Yang, Conceptualizing and Measuring Marital Virtues. S.M. Stanley, Assessing Marital and Couple Relationships: Beyond Form and Toward a Deeper Knowledge of Function. K.A. Moore, J. Bronte-Tinkew, S. Jekielek, L. Guzman, S. Ryan, Z. Redd, J. Carrano, G. Matthews, Developing Measures of Healthy Marriages and Relationships. Part III: Separation and Divorce. L. Bumpass, K. Raley, Measuring Separation and Divorce. M. O'Connell, The Visible Hand: Editing Marital History Data From Census Bureau Surveys. Part IV: Household Composition and Family Relationships. P.D. Brandon, Mapping Children's Living Arrangements With a Relationship Matrix. M. Hill, P. Callister, Is Single-Parent Family a Misnomer Misdirecting Research and Policies? W.D. Manning, R.E. Bulanda, Cohabitation and Measurement of Family Trajectories. J. Iceland, Measuring Poverty With Different Units of Analysis. G.J. Gates, R. Sell, Measuring Gay and Lesbian Couples. W.D. Mosher, Including the Military and Incarcerated in Surveys of Families. Part V: Becoming a Father. F.L. Mott, D.S. Hurst, T. Gryn, Male Relationship and Fertility Data in the NLSY. S. Boggess, G. Martinez, C.B. Jasik, L.D. Lindberg, Counting Dads: Improving Estimates of Teen Fatherhood. W. Marsiglio, Qualitative Insights for Studying Male Fertility. C. Bachrach, Taking Stock: Do Surveys of Men's Fertility Deliver? Part VI: Fathers and Fathering. S.L. Hofferth, N. Cabrera, M. Carlson, R.L. Coley, R. Day, H. Schindler, Resident Father Involvement and Social Fathering. L. Argys, E. Peters, S. Cook, S. Garasky, L. Nepomnyaschy, E. Sorensen, Measuring Contact Between Children and Nonresidential Fathers. S. Garasky, E. Peters, L. Argys, S. Cook, L. Nepomnyaschy, E. Sorensen, Measuring Support Provided to Children by Nonresidential Fathers. Part VII: Conclusion. S.L. Hofferth, L.M. Casper, Progress Made, Gaps Remain: Final Observations.