To effectively persuade a reader to support the claim that middle-school students should be required to wear uniforms, the most compelling piece of evidence could be statistical data showing the positive impact of school uniforms on student behavior, academic performance, or overall school climate. For example, research indicating that schools with uniform policies see a reduction in bullying incidents or an improvement in student focus and attendance rates would serve as strong evidence.
Including testimonials from educators or studies that demonstrate a correlation between uniforms and enhanced student discipline or equality can also reinforce the claim. This evidence not only highlights the practical benefits of uniforms but also addresses social dynamics among middle-school students.