uanita, a second grader who recently arrived from Mexico with rudimentary English skills, was referred for a special education assessment after displaying sustained poor academic performance in the classroom. With permission from her parents, the team began the assessment process. Juanita's scores on the intelligence exam (WISC-III) demonstrated an IQ similar to students with moderate intellectual disabilities. She also performed poorly on the school's standard reading, spelling, and writing tests. However, her adaptive and social living skills were above average. Before the team recommends Juanita for special education, which principle of IDEA should they be concerned that they may have violated?