The number of schools that have failed to make "adequate yearly progress" under the federal No Child Left Behind Act is proving to be a moving target, as states clean up erroneous data and grant appeals to schools that challenge the unwanted label. Under the Elementary and Secondary Education Act that aims to raise students academic progress, schools are required to test 95 percent of their students as the primary basis for calculating whether schools and districts have made adequate yearly progress (AYP). Schools receiving Title I money that consistently fail to meet their targets face increasingly severe sanctions, such as their student be allowed to transfer. States also must design rewards and penalties for non-Title I schools.