 Opinions in the Hegselmann-Krause model are mapped as numbers in the [0, 1] interval, with initial opinions spread uniformly at random in an artificial population. Individuals update their beliefs by taking an average of the opinions that are “close enough” to an agent’s own. As agents’ beliefs change, a different set of agents or a different set of values can be expected to influence further updating. A crucial parameter in the model is the threshold of what counts as “close enough” for actual  influence.[4]