Regular education kindergarten classrooms in Boston have one full-time professional teacher and up to 22 children. Bilingual education classes and classes with special education students are smaller. Some classrooms have a part-time teacher’s aide, an assistant from a community program like City Year and/or a student teacher. Some teachers have parents and other volunteers work with them on special projects or on a regular basis. K1 Classrooms (some people call it "four-year-old kindergarten") There are very few seats in the Boston Public Schools for four-year-olds. For example, in the last school year, there were more than 4400 K2 seats, but only 700 K1 seats, largely for children with disabilities or children who are siblings of older kids in the school. K0 classrooms: These seats are primarily for three-year-old children with special needs, but thee are some general education seats in K0 classrooms so that the classes can be integrated. Early education Centers (EECs) and Early Learning Centers (ELCs): These popular programs offer only K0 or K1 through first grade. They include free before and after school care. BPS has six in the city with two in each zone; they have very long wait lists.