Over the last year and a half, research staff working on the California Child Welfare SDM® Project generated important evidence about the project’s effectiveness in improving child welfare worker decision making and child/family outcomes. This report describes the results of the latest efforts to achieve the first goal of SDM® to improve the decision making capabilities of California’s child welfare workers by supplying them with accurate (valid) assessment tools for their use in assessing child welfare cases and making crucial case management decisions.