“Idea flow” is the ease with which new thoughts can permeate a group. Pentland likens it to the spread of the flu: a function of susceptibility and frequency of interaction. The key to increasing the “contagion” is trust and connectivity between otherwise separate elements of an establishment. The two major determinants of idea flow, Pentland has found, are “engagement” within a small group like a team, a department, or a neighborhood, and “exploration”—frequent contact with other units. In other words: a team of teams.”