 Kevin Zollman, following Bala and Goyal (1998), used network theory to model different possible communication structures. The aim of Zollman (2007, 2013) is to investigate what difference communication structures make to the chances of a scientific community settling on a correct (or incorrect) theory or hypothesis and to the speed by which such a consensus is reached. Networks consist of nodes and edges that connect them. The nodes can represent individuals or any group that has uniform beliefs. The nodes can have values of believe or not believe and consensus consists in all nodes in the network taking the same value. Zollman investigates three possible communication structures: the cycle, in which each node is connected only to nodes on either side of it in the cycle; the wheel, in which there is a central node to which all other nodes are exclusively connected; and the complete, in which each node is connected to every other node. Using the mathematics of network theory, Zollman proves the somewhat counterintuitive thesis that the network with limited communication, the cycle, has the highest probability of consensus on the correct hypothesis, while the network with the densest communication, the complete, has a non-negligible probability of consensus (from which departure is not possible) on the incorrect hypothesis. Zollman (2010) also uses this method to investigate the division of labor problem, although he comes at it from a slightly different point of view that do Kitcher or Strevens. Structures with sparse or limited communication are more likely to arrive at the correct hypothesis, but because they take longer to reach consensus, different research approaches may persist in such communities. Under the right circumstances, this will prevent foreclosure on the incorrect hypothesis. Zollman implicitly blames a dense communication structure for the premature abandonment of the bacterial hypothesis of peptic ulcers. Diversity is a good thing as long as the evidence is not decisive, and if the acid hypothesis, which held sway until a new staining method showed the presence of Helicobacter pylori, had been slower to diffuse into the community, the bacterial hypothesis might have been preserved long enough to be better supported.