The number of women—especially women of color—in leadership ranks at the world’s largest companies remains desperately small. Tina Opie, associate professor of management at Babson College, offers a new practice for women to lift each other up and fight systemic bias in the workplace, something she calls “shared sisterhood.” The idea is to be more honest with each other, forming truer bonds. That involves listening, understanding yourself, and a willingness to take risks. With University of Iowa management professor Beth Livingston, Opie wrote the new book “Shared Sisterhood: How to Take Collective Action for Racial and Gender Equity at Work.”