More from http://www.orgnet.com/tnet.html A covert network must meet three competing goals... 1.Establish efficient communication and information flow within and between many cooperating cells by minimizing path length throughout the network. 2.Limit discovery and monitoring of the network from outsiders by minimizing the number of communication links in the network. 3.Limit damage when a node is discovered or removed from the network by minimizing the number of direct ties each node has. Because of these constraints, covert networks have a different topology than normal social networks. Illegal networks tend to exchange efficiency for secrecy.