In a petition for writ of mandate in an underlying Code of Civil Procedure section 404.1 coordination action involving 470 civil cases, alleging Ford breached warranties with respect to cars equipped with the DPS6 transmission, and in which the coordination judge refused to add to the coordination proceeding 467 substantively indistinguishable cases in the same counties, the petition is granted where: 1) a trial judge's order declining to add cases to a coordination proceeding, like the coordination motion judge's original order, is subject to our independent review; and 2) the trial court erred in refusing to add the cases to the proceeding.