In the United States, substitute teachers find jobs by first completing the application and interview process from their local school district. Once approved, they will either be enrolled in an automated calling system or more currently, via a system that uses the internet to post available substitute teaching assignments. Substitutes can also find work by contacting private schools in their district. Most substitute teachers in the U.S. can be assigned to work in all academic subject areas as needed (except for long-term substituting assignments). The substitute is generally responsible for closely following and continuing with the lesson plans left by the teacher, and to maintain student order and productivity. As with locum tenens physicians, the idea is that continuity exists between the work done by the substitute and that done by the other professional. Substitutes work with the same students as the regular teacher does. Substitute teachers can often work in multiple schools within one district, as well as for multiple school districts.