The two-way bilingual language arts portfolio was designed to help teachers, administrators, parents, and others understand the level of language arts development of students in the two-way bilingual program. It was originally conceived as a method of student assessment, to substantiate teachers' observations that students were making significant progress in the two program languages (native and second). The portfolio format presented here consists of: (1) an outline of assessment procedures for different grade levels; (2) a timeline for data collection using each form of evaluation at each grade level (K-6); and (3) forms for each evaluation method. The evaluation forms include a matrix for assessing student oral language skills, a form for evaluating an interactive writing journal (K-1, 2-6), reading rubric assessment scales (K, 1-2, 3-6), guidelines for informal reading observation (1-6), a parent questionnaire concerning the child's reading and writing habits, a student reading attitude questionnaire (K, 1-2, 3-6), and a thematic book list form. (MSE)