Here is a link to a research review by Ofelia Garcia, Jo Anne, Kleifgen, and Lorraine Falchi on changing the term used to refer to students who are learning to be proficient multilingual students from ESL/ELL/LEP to Emergent Bilinguals or Multilinguals. The terms ESL, ELL, and LEP put a negative emphasize on students' limitations and fail to point out the  the funds of knowledge and multiple literacies these students are bringing to our classrooms.

http://www.equitycampaign.org/i/a/document/6532_Ofelia_ELL__Final.pdf