Teachers at Orlando Day Nursery in Florida have always evaluated how well their 4-year-old prekindergartners--most of them poor and African-American--could recognize letters, isolate sounds in words, understand stories read to them, and show other hallmarks of early literacy. Just as important, though, have been the teachers' formal observations…

When it comes to educational challenges, the nation's 12.1 million Hispanic schoolchildren face plenty: language, poverty, lower-than-average graduation rates for high school and college, and, more recently, a wave of laws targeting illegal immigrants that has made school seem like less of a safe haven for Hispanic students in some states. Yet, as…