Furthermore, beginning teachers are often advised to script some sections for themselves, such as questions they might ask the students in order to get a discussion going at the beginning of the lesson. The expectation is that the teachers can and should depart from the script when appropriate; improvisation is definitely encouraged and the fact of having written it out in advance ensures that an adequate amount of thought has been put into it ahead of time. Another reason for including a great amount of detail is that student teachers are often required to submit lesson plans in advance to their mentor teachers or professors in order to receive feedback on their ideas.