ABSTRACT
Chapter Overview This chapter focuses on the challenges that professionals who specialize in testing and measurement face when they try to ensure that standardized tests are valid and reliable for both the mainstream population for which they are originally designed and the population of English language learners (ELLs). It also addresses the issues that educators and test users need to consider when they make decisions concerning the use of those tests with ELLs to ensure that content-based tests do not become tests of English language proficiency rather than the particular skills and knowledge they purport to assess.
