soheil_hooshdaran wrote:
The performance-study groups at U.C.L.A. are an extracurricular activity.?
In the context of a university (assuming the U.C is an abbreviation for University College), the term "extracurricular activity" has a particular technical meaning, being that it isn't part of the formal material of the course.
I wasn't sure what a performance study group is, regardless of where, if at all, you place the hyphen. A Google for UCLA performance study did unearth the existence of courses at UCLA in "Theater and Performance Studies", so it's the name of an academic subject.