Chapter 7’s four rewritten cases deal with proof of systemic disparate treatment and impact discrimination. The rewritten Sears opinion rejects expert testimony that blamed women’s lack of interest in commission-based sales for the dearth of women employed in those jobs, characterizes this testimony as sex stereotyping, and holds that courts may not rebut strong statistical showing by plaintiffs in pattern or practice cases with sex stereotypes. Rewritten AFSCME exposes implicit bias in the market forces causing a pay gap between men and women, and narrates the real-life stories of the women whose pay was substantially lower in jobs of equal value to those of male colleagues. Rewritten Ricci holds that white plaintiffs who challenge an employer’s failure to use a test with a disparate impact on black and Latino employees must show that the employer lacked an actual and reasonable belief that it would be subject to liability for disparate impact if it used the test. Rewritten Wal-Mart certifies a large class of female employees, and holds that a showing of intent is not necessary when the statistics demonstrate discriminatory outcomes and the employer fails to rectify the problem.