Abstract
Employees reported the history of their friendships with peer coworkers, rating the importance of several developmental influences and a variety of communication changes as their friendships experienced three transitions: acquaintance‐to friend, friend‐to‐close friend, and close friend‐to very close/almost best friend. Results indicate that in same‐sex friendships, the influence of workplace contextual factors (e.g., sharing tasks and proximity) decreased and the influence of extra organizational influences increased as the friendships became closer. In cross‐sex friendships, however, workplace contextual factors retained their importance over the development of the friendship, suggesting individuals in cross‐sex friendships try to maintain the boundary between work and personal spheres by keeping their friendships defined as a “workplace” relationship.