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Randall Eberts explores the role of teachers unions in public education. He focuses particularly on how collective bargaining agreements shape the delivery of educational services, how unions affect both student achievement and the cost of providing quality education, and how they support educational reform efforts. Eberts s synthesis of the empirical research concludes that union bargaining raises teachers' compensation, improves their working conditions, and enhances their employment security-while also raising the cost of providing public education by upwards of 15 percent. The effect of unions on student performance is mixed. Students of average ability who attend school in union districts perform better on standardized tests, whereas low-achieving and high-achieving students perform worse. However, the overall gain in achievement does not make up for the higher cost. Of late, unions have begun to be …