California Code, Code of Civil Procedure - CCP § 2019.020

(a) Except as otherwise provided by a rule of the Judicial Council, a local court rule, or a local uniform written policy, the methods of discovery may be used in any sequence, and the fact that a party is conducting discovery, whether by deposition or another method, shall not operate to delay the discovery of any other party.

(b) Notwithstanding subdivision (a), on motion and for good cause shown, the court may establish the sequence and timing of discovery for the convenience of parties and witnesses and in the interests of justice.