This quasi-experimental study investigated the effects of an Internetdelivered universally designed depth of vocabulary intervention that targeted both English-speaking and Spanish-English-speaking students. Two hundred forty students, 49% of whom were Spanish-English bilinguals, participated in the 16-week intervention. Intervention students read eight multimedia texts with embedded instruction on 40 words and reading strategy support. Students could access all texts and activities in Spanish and English. In comparison to a control group, there were significant intervention effects on a standardized measure of vocabulary knowledge, but effects were non-significant for comprehension. Similarly, significant effects on researcher-developed measures of vocabulary depth were detected, but not for a researcher-developed measure of breadth.

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The relation of language of instruction and vocabulary to the English spelling of bilingual first graders receiving either English or Spanish literacy instruction and of monolinguals in English literacy instruction was explored. Only bilingual students in Spanish literacy instruction (SLI) exhibited Spanish-influenced spelling, indicating a powerful effect of language of literacy instruction. SLI without English literacy instruction (ELI) may be a prerequisite for the appearance of Spanish influences in English spelling. Spanish-influenced spelling appears to be a normal developmental phenomenon only for those bilingual first graders who have received no ELI. The students in ELI, on average, wrote more orthographically plausible English pseudowords than students in SLI, indicating that the students in SLI simply had not yet learned conventional spelling patterns in English. In addition, children with good Spanish vocabulary showed more Spanish-influenced spelling, while English vocabulary predicted more orthographically plausible English spellings. The relationship between English vocabulary and English spelling was similar for children instructed in Spanish and English. English vocabulary and literacy instruction both made unique, positive contributions to English pseudoword spelling, while Spanish literacy instruction played a more important role than Spanish vocabulary in the production of Spanish-influenced spelling in English.

This study examined the relative contribution of reading comprehension strategies and interactive vocabulary in Improving Comprehension Online (ICON), a universally designed web-based scaffolded text environment designed to improve fifthgrade monolingual English and bilingual students' reading achievement. Seventy-five monolingual English and 31 bilingual students from six classrooms were assigned to one of three ICON conditions: reading comprehension strategies, vocabulary, or a combined version of comprehension strategies and vocabulary. Students read eight multimedia folktales and informational texts within their respective ICON condition and completed embedded activities, researcher measures of comprehension and vocabulary, and pre-and postintervention standardized reading achievement tests. ANCOVA results indicated that after controlling for initial reading achievement, there was a main effect for condition on the researcher measure of vocabulary, with