 Various other terms are also used to refer to students who are not proficient in English, such as English as a Second Language (ESL), English as an Additional Language (EAL), limited English proficient (LEP), Culturally and Linguistically Diverse (CLD), non-native English speaker, bilingual students, heritage language, emergent bilingual, and language-minority students.The legal term that is used in federal legislation is 'limited English proficient'.In a five-week study by Huang, research showed that "classroom instruction appeared to play an important role in integrating language skills development and academic content learning," This study showed that the "students acquire linguistic/literacy skills and scientific knowledge hand in hand as they assume various communicative and social roles within carefully planned language activities".