[Excerpt] It is claimed that 'curriculum-based external exit exam systems', CBEEES, based on world class content standards will improve teaching and learning of core subjects. What evidence is there for this claim? New York's Regents Exams are an example of such a system. Do New York students outperform students with similar socio-economic backgrounds from other states? Outside the United States such systems are the rule, not the exception. What impacts have such systems had on school policies, teaching and student learning?