Studies of nearly a dozen welfare programs were reviewed to determine the effects of welfare policies on children and youth and to identify issues requiring consideration during reauthorization of the Temporary Assistance for Needy Families program. The following were among the key findings: (1) the school achievement of elementary school-age children are improved by welfare programs that increase both parental employment and income by providing earnings supplements to welfare recipients when they go to work; (2) programs that mandate participation in employment-related services typically increase parental employment but not income and have few short- or long-term effects on elementary school-age children; (3) although time-limited welfare programs can be implemented in ways that avoid widespread harm for elementary school-age children, the combination of earnings supplements with short time limits on welfare may reduce the positive effects that such supplements bring to children; (4) adolescents' school achievement and progress have been negatively affected by their parents' participation in both voluntary and mandatory programs promoting work and programs with and without time limits on benefit receipt; and (5) some evidence suggests that the observed negative effects on adolescents result from "child care problems" associated with maternal employment. (Contains 11 endnotes and 6 references.) (MN)