Diversity initiatives are popping up all over, particularly within technology companies that have a preponderance of white men among executives and staff.

Several organizations started by putting measures in place to ensure new hires were drawn from a more diverse talent pool. Now, a new study from researchers at the University of Colorado aims to show that simply adding one minority candidate to the pipeline doesn’t guarantee a quick fix.

You can hardly blame them for trying. The business case for diversity–even in a more nuanced form–is hard for companies to ignore. So the likes of Facebook, Slack, and Pinterest attempted to change the ratio by taking a page from the NFL’s Rooney Rule. It requires at least one person from an underrepresented background and one female candidate to be interviewed for every open leadership position.

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