[Excerpt] WARN was passed only after a decade of strenuous debate. We can now look back and address a number of issues it raised. What benefits did its proponents think would arise from the notice legislation, and what costs did its opponents think there would be? What public policies toward advance notice do other nations have? Did displaced workers in the United States receive advance notice before the passage of WARN? What do we know empirically about the effects on workers and firms of the provision of advance notice? What has experience under WARN taught us? Finally, what research issues need to be addressed to decide if WARN is a good idea, and what alternative public policies might help facilitate the provision of advance notice to displaced workers?