Language planning and policy with regard to bilingual education are greatly influenced by the ideologies outlined by Richard Ruiz. In this article, we demonstrate that Ruiz's language-as-resource orientation requires that we use two-language assessments to study how program models are both developing and conserving the languages that students bring to school. We demonstrate through a study of students' writing how scholars might use such assessments to privilege bilingualism and present a more complete understanding of students' biliteracy development that counters the use of bilingualism in service to the hegemony of English, even when the same study includes a comparison of English outcomes of students in paired literacy as compared to students in English-only models. Findings reveal that students in paired literacy are becoming comparably literate in the domain of writing in Spanish and English as measured by a Biliteracy Writing Rubric. Furthermore, when their English language outcomes are compared to those of their peers in English-only contexts, the differences are found to be statistically insignificant.