Ex-Yahoo Manager Says Rankings Violate Employment Laws

One of Marissa Mayer’s signature policies as chief executive of Yahoo has been the quarterly performance review, in which every employee at the company is ranked on a scale of 1 to 5. Now, as Ms. Mayer prepares to announce a streamlining plan on Tuesday that is likely to involve even more job cuts, one former manager who lost his job is challenging the entire system as discriminatory and a violation of federal and California laws governing mass layoffs.