Researcher: Any country can determine which type of public school system will work best for it by investigating the public school systems of other countries.
Evidence
Nationwide tests could be given in each country and other countries could adopt the system of the country that has the best scores on these tests.
Conclusion
Any country can determine which type of public school system will work best for it by investigating the public school systems of other countries.
Evaluate
This argument doesn't consider the fact that a public school system that works best for one country may not work best for another country. Those countries may have different circumstances that preclude a particular school system that works well in one place from working well in another.