Language learning is context-dependent and requires learners to employ different sets of language skills to fulfill various tasks. Yet standardized English as a foreign language assessments tend to conceptualize English proficiency as a unidimensional construct. In order to distinguish English proficiency as separate context-driven constructs, I…

Despite the current theoretical momentum for the importance of academic English and the acknowledgment that academic materials increase in complexity through the grades, little empirical attention has been devoted to the role of academic English in academic achievement. This study examined the amount of variance in academic achievement explained…

One dimension of language proficiency considered important for reading and writing academic texts is morphological awareness--the understanding of how complex words are formed from meaningful smaller units (i.e., affixes, roots) that contribute to words' meanings and functions. This quasi-experimental study evaluated the effects of instruction on…

Two experimental studies to improve vocabulary knowledge and comprehension were conducted in 7th-grade social studies classes with English language learners (ELLs). Two different nonoverlapping samples of classes of 7th-grade students (N = 381 and N = 507) were randomly assigned at the classroom (i.e., section) level to a social studies…

In this article, I describe mainstream middle school classrooms designed to re-think the conditions under which language minority students who have lived in the United States for a number of years can develop English language skills while also gaining access to a rigorous curriculum. I describe a variety of transactions that students used to…