The first one is called an engagement interaction. Those are the interactions within circles of trust, family, friends, close co-workers, etc. Higher frequency of engagement interactions are a predictor of productivity, as it helps coordinating the behavior of a group. The second type of interaction is called an exploration interaction, referring to times when we expose ourselves to people outside of our regular circles. This is generally how we learn new ideas. Having more exploration interactions can be a predictor of the level of innovation of a company or team.