 The covariation model states that people attribute behavior to the factors that are present when a behavior occurs and absent when it does not.Thus, the theory assumes that people make causal attributions in a rational, logical fashion, and that they assign the cause of an action to the factor that co-varies most closely with that action.Harold Kelley's covariation model of attribution looks to three main types of information from which to make an attribution decision about an individual's behavior.