OPINION OF THE COURT
We are faced with petitions for a writ of mandamus filed by The Celotex Corporation, Carey Canada Inc., Armstrong World Industries, Inc., Asbestos Corp., Ltd., Bell Mines, Ltd., Asten Group, Basic, Inc., Benjamin Foster-Amchem, Union Carbide Corp., Cassiar Resources, Ltd., Brinco Mining, Dana Corporation, Empire Ace Insulation, Fibreboard, GAF Corporation, Georgia-Pacific Corp., Uniroyal, Inc., W.R.
I.
In 1984, the district court certified a nationwide opt-out class of school districts seeking to recover from approximately fifty defendants. The purpose of certifying the national school asbestos class was primarily to expedite the resolution of the schools’ asbestos-in-buildings claims. In re Asbestos School Litigation,
The use of the class action device appears to offer some hope of reducing the expenditure of time and money needed to resolve the common issues which are of substantial importance_ “It is difficult to imagine that class jury findings on the class questions will not significantly advance the resolution of the underlying hundreds of cases.”
Id. at 1010 (citation omitted). Though voicing some concern about manageability of the class, we acceded to the district court’s determination that the litigation would be manageable, both because of that court’s greater familiarity with trial management concerns and because class actions are always subject to decertification “[w]hen, and if, the district court is convinced that the litigation cannot be managed ...” Id. at 1011.
In April, 1989, the petitioners, who are two of the fifty defendants in the district court, moved for decertification, arguing, inter alia, that the class was demonstrably unmanageable. The district court denied the motion on January 11, 1990 and this petition for writ of mandamus followed.
In this litigation a question was raised as to jurisdiction. We determined in In, re School Asbestos Litig.,
II.
On proper appeal from a final judgment, or a certification under 28 U.S.C. § 1292(b), review of the certification of a class is governed by the abuse of discretion standard. Pa. Dental Ass’n v. Medical Services Ass’n of Pa.,
Mandamus is a drastic remedy which should be invoked only under extraordinary circumstances amounting to a judicial “usurpation of power,” Will v. United States,
III.
We do not write on a clean slate here. We considered the precise question sub judice earlier in DeMasi v. Weiss,
The sine qua non of entitlement to mandamus relief is that the party seeking the writ have no other adequate remedies, Kerr v. United States District Court,
We write and publish here only to emphasize that this court adheres to its decision in DeMasi and does not intend to dilute our clear holding that precludes the use of mandamus to reverse the grant or denial of a class certification.
IV.
The petition of Celotex for the writ of mandamus at No. 90-1217 will be stayed. The petitions of all other petitioners at No. 90-1217 and Eagle-Picher at No. 90-1219 will be denied.
