Opinion ID: 200373
Heading Depth: 2
Heading Rank: 1

Heading: standard of review

Text: 17 Orders certifying or decertifying a class are reviewed for abuse of discretion. Califano v. Yamasaki, 442 U.S. 682, 703, 99 S.Ct. 2545, 61 L.Ed.2d 176 (1979). A district court abuses its discretion when it relies significantly on an improper factor, omits a significant factor, or makes a clear error of judgment in weighing the relevant factors. See Schubert v. Nissan Motor Corp., 148 F.3d 25, 30 (1st Cir. 1998). An abuse of discretion also occurs if the court adopts an incorrect legal rule. Waste Mgmt. Holdings, Inc. v. Mowbray, 208 F.3d 288, 295 (1st Cir.2000). Here the district court abused its discretion in decertifying the contract class and the ch. 93A class. 5