Cal. Educ. Code § 56381
(a)
(2) A reassessment shall occur not more frequently than once a year, unless the parent and the local educational agency agree otherwise, and shall occur at least once every three years, unless the parent and the local educational agency agree, in writing, that a reassessment is unnecessary.
If the reassessment so indicates, a new individualized education program shall be developed.
(b) As part of a reassessment, the individualized education program team and other qualified professionals, as appropriate, shall do the following:
(2) On the basis of the review conducted pursuant to paragraph (1), and input from the parents of the pupil, identify what additional data, if any, is needed to determine:
(f)
(i)