to do various kinds of work for a course: Attending course sessions. Reading and studying course readings assigned in the course syllabus. Discussing material they have read. Writing short and long papers based on assigned reading and their own library research. Completing homework or problem sets. Completing laboratory exercises. Taking quizzes and examinations. The exact work required depends on the discipline, the course, and the particular instructor. Unlike most European university courses, grades are generally determined by all of these kinds of work, not only the final examination. Elective and required courses An elective course is one chosen by a student from a number of optional subjects or courses in a curriculum, as opposed to a required course which the student must take. While required courses (sometimes called "core courses" or "general education courses") are deemed essential for an academic degree, elective courses tend to be more specialized. Elective courses usually have fewer students than the required courses. The term elective is also used for a period of medical study conducted away from the student's home medical school, often abroad. Motivations for choosing such a program include a wish to experience other cultures and to learn how to work in the clinical situations in other countries. Typically, North American universities require students to achieve both breadth of knowledge across disciplines and depth of knowledge in a particular chosen subject area, known as a major. Thus, students of the Arts or Humanities are required to take some science courses, and vice versa. Normally, students are free to choose their particular electives from among a wide range of courses offered by their university, as long as the students possess the prerequisite knowledge to understand the subject matter being taught. An English major, for example, might also study one or two years of chemistry, biology or physics as well as mathematics and a foreign language. Elective courses are also offered in the third and fourth years of university, though the choice is more restrictive and will depend upon the particular major the student has chosen. For example, at the University of British Columbia, students intending to specialize in Sanskrit as part of a major in Asian language and culture will usually have to complete several Sanskrit and Hindustani or Punjabi courses during the first two years of university, as well as additional courses in other languages of India in the third and fourth