The employment of foreign workers within the cluster shows its openness but it does not explain another element incorporated in the definition of COI: being global. This means looking at the entire globe as a market from the very beginning despite taking advantage of local conditions. But it also means international exchange of resources and synergies through Networks of COI (NCOI) defined as "connections between individuals, firms, universities, research centers, and other organizations in geographically dispersed COI".[9] Three types of international linkages have been identified: