This volume, "Measurements and Measures" is the second of three Technical Appendices to the National Day Care Study (NDCS) and presents seven individual reports on a series of technical tasks undertaken to support the principal analyses of the effects of key center characteristics on children. Among the topics covered: analysis of alternative measures of classroom composition; psychometric analysis of the NDCS test battery; and analyses of several other more peripheral instruments used in the study. Also presented are results of a special survey of parents of subsidized children taken during Phase III of the NDCS, and analyses of the impact on children of other center characteristics, such as physical space and program orientation, and economic factors. (Author/MP)