Companies want employees to share what they know. After all, research has found that this leads to greater creativity, more innovation, and better performance, for individuals, teams, and organizations. Yet despite companies’ attempts to encourage knowledge sharing (think of those open office spaces), many employees withhold what they know — a phenomenon known as knowledge hoarding or knowledge hiding. They may play dumb, pretend not to know something, promise to share something but never do it, or tell people they can’t share when in fact they could.