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Learning What Works: Continuous Improvement in California's Education System. Policy Brief 08-4.

What will it take to bring about dramatic improvements in the performance of California’s education system? The fact is, we don’t know. California does not now collect the kind of educational data that would allow us to accurately measure the performance of schools and students, or to evaluate the effectiveness of different educational policies and practices. We design and implement policies in ways that make it difficult or impossible to identify whether new approaches improve performance or increase learning.