The number of activities can sometimes be difficult to define. For example, an online forum might be one activity or a series of activities. However the organization or COP chooses to define these events, it is important to consistently count across the organization and across different activities. Professional contacts, such as those measured by this indicator, can help transfer tacit knowledge, which otherwise can be difficult to record and share with others. The sharing of tacit knowledge, which is based on direct experience, usually occurs person-to-person and, therefore, depends greatly on the interaction of individual human beings (Alajmi, 2008). Through storytelling and similar methods, professional groups and COPs are often the forums for sharing tacit knowledge within and across organizations (Schubach, 2008). The social nature and shared context of some of these groups promotes common understanding and encourages active engagement—that is, people’s openness and willingness to share their own experiences and to respond to those of others—and continual learning (Athanassiou, Maznevski, & Athanassiou, 2007; Schubach, 2008).