Bring a copy of your most recent transcript and the declaration of major form from your college dean's office. Students in the classes of 2001 or later will need to apply to the Bloustein School. Fill out the application and write the required essay. Deadlines for applications are October 1 to be admitted to the major in time for spring registration and March 1 to be admitted in time for fall registration. The course I want to take is full.
Different professors have different policies.
Call or email the professor to ask what his or her policy is. Some will give special permission numbers before the semester begins, others will ask you to come the first day of class. It is up to the professor to decide for his or her own course. Please do not call the department secretary to request special permission numbers unless the professor has told you to do so. The department has a limited number of faculty members to cover all the courses they teach.