California Code, Education Code - EDC § 56343

(a) A pupil has received an initial formal assessment.  The team may meet when a pupil receives any subsequent formal assessment.

(b) The pupil demonstrates a lack of anticipated progress.

(c) The parent or teacher requests a meeting to develop, review, or revise the individualized education program.

(d) At least annually, to review the pupil's progress, the individualized education program, including whether the annual goals for the pupil are being achieved, and the appropriateness of placement, and to make any necessary revisions.  The individualized education program team conducting the annual review shall consist of those persons specified in subdivision (b) of Section 56341.  Other individuals may participate in the annual review if they possess expertise or knowledge essential for the review.