https://paloaltoonline.com/blogs/p/print/2017/08/20/university-of-california-augmented-review-policy

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University of California Augmented Review Policy

Taken from the UC Counselors and Advisors Bulletin:

UC Regents adopted an Augmented Review Policy, effective for the 2018-19 admission cycle which allows campuses to request supplemental information from no more than 15 percent of applicants. The new systemwide policy codified an existing practice of augmented/supplemental review that a few campuses have used for many years (e.g., Berkeley, Davis, Los Angeles, and San Diego).
Most applications (98%) to UC are complete as submitted without the need for additional information.

There are three types of supplemental information that may be requested of an applicant; seventh-semester grades, response to a questionnaire and/or letters of recommendation.
There is no requirement nor expectation that all campuses will use Augmented Review.

To review the FAQ's, please click on the LINK.