This final report of the National Day Care Study (NDCS), Volume II, provides researchers, social scientists and lay readers with information for judging the soundness of the evidence underlying NDCS conclusions about relationships between regulatable center characteristics and the outcome of care for the child. Thus, Volume II makes free use of the technical apparatus of developmental psychology and statistics. In order to allow this volume to be read alone, without the necessity of constant cross-reference to Volume I: "Children at the Center," certain sections of that volume are included in Volume Two. In particular, the sections of Chapter One that address the study design and variables have been taken substantially from Volume I, as has the portion of Chapter Two that describes the study sample. Other sections of Chapter One and Two are new, including a discussion of general analytic issues and approaches. Chapters Three through Six describe instruments, analyses and results linking regulatable center characteristics to caregiver behavior, child behavior and child test scores. These chapters constitute detailed support for Chapters Five and Six of "Children at the Center," which summarized the study's results on quality of care. The major findings of the NDCS are summarized in the Preface to Volume II. They are restated in Chapter Seven, amplified by details from Chapters One through Six. (Author/RH)