What Is the Optimal Size of A Network?

Based on this theory, the researchers also noted that a small number of agitators can compel groups, with 150 being the most vulnerable size to compulsion.

“Dunbar et al. observed an optimal value of 150, but Dr. West and his colleagues are the first to present a computational approach to the theoretical information dynamics process, which is essential for problem solving, developing team factions and forming cohesive teams,” said Dr. Lisa Troyer, head of ARO's Social and Behavioral Sciences Research Program. Troyer said: “This is an important leap forward in social science theory and may lead to further research and insights into collective action.”

Dunbar predicts that there is an optimal structure for the size of social groups. He refers to these size groups as nested hierarchies, and they have a scale of about 3. Thus, he identifies a size sequence of cognitively effective social groups 5, 15, 50, 150, and 500, and explains that the strength of relationships at these levels is not equal.

“The hierarchical sequence is interesting because each number in the sequence is the actual combat unit specification developed by the U.S. Army Based on actual experience, ranging from small groups of about 15 men to platoons of 45 men or less. Three platoons make up a company, three companies make up a brigade, and so on. This has been the intuitive division of military hierarchy by military leaders since the Roman Empire.”

“The size of the team may be the determinant of the potential success of complex missions, and the keys to complete complex missions are adaptability and collective problem solving,” West said. “The same can be applied to the reverse process, that is, to transmit false information in adversarial groups. The size of the group may sometimes be more important than the credibility and form of dissemination of the lies.”