The purpose of this project is to examine relations between quality measures and child outcomes within QUINCE and Early Head Start data, examining for both linear and nonlinear associations. When nonlinear relations are found, we do additional analyses to determine where cut points are located and whether quality above and below the cut point differentially relates to outcomes. The research questions include: (1) Are relations between quality and child outcomes linear or nonlinear?; (2) If nonlinear, what are critical cut points or thresholds?; (3) Can reliable factors within Rating Scale and CIS measures be identified?; and (4) Do the relations hold for selected subgroups?