Toronto boasts a large and diverse system of public alternative schools: schools where democratic practices, student access and a commitment to public education are fundamental. There are academic schools; schools with thematically focused curricula; schools driven by social movement principles such as antiracism and global education; schools for students who do not thrive in mainstream schools; and schools with alternative scheduling and delivery practices for students who must work. The schools are small, supporting personalized relationships among teachers and students, with teacher-driven curricular programs that are responsive to student interests. Curricular innovation is made possible because alternative schools are only loosely coupled with the rest of the public education system, but they still must comply with school system regulations. This paper describes how teachers' work and the structural elements of alternative schools support school-based innovation.