The Spanish Two-Way Immersion curriculum documents are the result of many hours of meeting with teachers and defining not only what students are to learn in the respective content areas, but also what students must master in the structures and functions of the languages themselves. In order to create a curriculum that goes beyond a list of goals and objectives, the TWI curriculum is organized by concept-based, student-centered units that encourage continuity of ideas and vocabulary for students and make learning not only cognitively challenging and intrinsically interesting, but personally relevant as well.