UCI and UCSD will consider alternate majors and may even admit as Undeclared if an applicant does not meet the alternate major threshold .
For UCSB the College of Letters and Sciences does not consider major choice for admission so alternate majors are normally not considered. If any applicant is applying to the College of Engineering or CCS, then an alternate major will be considered. If no alternate major is listed for COE or CCS applicants, then they may be admitted Undeclared.