The department should suggest prerequisites or restrictions, if any, to a SEC. An SEC paper may have restrictions for students belonging to a particular subject (or discipline). For example, a student with honours in Computer Science will not be eligible to take an SEC on Basics of Computer and DTP. Or a student with regular course on Mathematics will not be eligible to take an SEC on Basic Mathematical Skill. If any restrictions are to be imposed, that has to be mentioned in the syllabus of the concerned course.