The idea and importance of cognitive diversity is nothing new. A 2004 study from researchers at the University of Michigan and Loyola Chicago found that creating groups of individuals who had diverse approaches to problem solving outperformed groups that were made up of only the most talented problem-solvers. And a 2012 study from McKinsey found that increased representational diversity could help a company’s bottom line, supporting the idea that outside of morality or justice, diversity may be helpful simply as a business strategy.

But this type of viewpoint may harm groups traditionally helped by diversity initiatives, and nod to a skewed view of society’s progress, says Wingfield. When it comes to the workplace there are many professions where racial, ethnic, and gender diversity are still hard to come by. In 2013, only 4 percent of U.S. physicians were black. According to 2012 research, Hispanics made up only about 3.7 percent of licensed lawyers, according to the American Bar Association. Asians accounted for only 3.4 percent of all lawyers. And we’ve all heard the narrative about the lack of gender diversity in STEM fields, where women made up only 26 percent of the workforce in 2011. “If we're not focusing on diversity to address all parts of our society by including those who have been historically most disenfranchised,” she said, “then a broad type of diversity doesn't really serve us well.”

Millennials are the most diverse group of young adults the nation has seen. And for some, that may mean that the idea of diversity, at least when it comes to race and ethnicity, feels like a given. Though inequalities that have existed for generations persist, some Millennials might think of them as less of a problem. But research, and current events, would show that may not be the case. “We live in a more diverse world in a superficial sense,” Wingfield says. “When we think about where we live, where we go to school, where we work, that type of diversity hasn't really happened yet.” That creates a gap between perception and reality she says. “Millennials have this reputation for having adopted this more progressive, forward-thinking viewpoint—at the same time, a lot of the institutions that structure their lives really haven't changed so much.”

And a 2014 study from the Public Religion Research Institute confirms that, finding that when it comes to social groups, most young Americans still tend to stick with those who are most like them. White Americans said that 91 percent of their social network was also white. For black Americans, about 83 percent of their social network was made up of other black Americans. Hispanics were found to have the most diverse peer groups, reporting that only 64 percent of their social group was made up of other Hispanic Americans, according to the study.