PUSD's Dual Language Immersion Program enables students to master academic subjects in both English and a target language (Spanish, Mandarin, or French). The program is based on a two-way, 90:10, language immersion model. Two-way means that classrooms are composed of both native English speakers and native speakers of the target language, so students can support each other in their development of both languages. The 90:10 model signifies that the kindergarten curriculum is taught 90% in the target language and 10% in English. At each subsequent grade level, the amount of instruction in English is increased by 10% so that by fourth grade, students are taught 50% in each language. In middle school, two courses are taught in the target language. High schools offer one or two courses in the target language.