@jlev96: I was unable to find any information on the difficulty of changing majors from Undeclared to CS. I would imagine that slots open up after students change their major from CS to ? or if they cannot handle the workload. I know at UCSD and UCSB, changing from Undeclared is very difficult. Both sons have friends that have tried in the past 2 years and ended up in a less competitive major such as Statistics or Math. Since UCI has a College dedicated to CS, it may be easier to change majors vs CS in the College of Engineering?? Sorry I cannot be anymore help.