Home schooling involves a tremendous commitment from the parents. At least one parent must be willing to work closely with the child, develop lesson plans, keep current with government requirements, and sometimes negotiate issues with the local school district. The most common home-schooling arrangement is for the mother to teach while the father works outside the home. There are numerous educational materials available that are geared for home-schooled children. These include correspondence courses, full curricula, and single topic books in areas such as math or phonics. There are both religious and non-religious publishers of these materials. Some parents do not use these materials and develop individualized lessons based on their children's unique learning needs.