The No Child Left Behind (NLCB) law has created some unique challenges for students who are English Language Learners (ELLs) and their teachers.
NLCB requires all students to reach "profieciency" in English Language Arts and mathematics by 2114, including ELLs who have the special challenge of learning English, which is overwhelmingly the language of instruction in the U.S.A.
This is an extremely difficult goal to achieve, perhaps an unrealistic goal. Some of the challenges are:
a) Historically, ELLs score much lower than other students on standardized tests and show very slow improvement from year to year;
b) Most tests are double challenges for ELLs--a test of content area, and a test of their English skills;
c) High-achieving ELLs are eventually removed from the ELL category; those remaining are the weaker students, who then drive down the performance of the group; ELL teachers become the victims of their own success.