The gateway belief model (GBM) is a dual process theory in psychology and the communication sciences. The model suggests that public perception of the degree of normative (expert) agreement – or (scientific) consensus – on societal issues, such as climate change, vaccines, evolution, gun control, and GMO's functions as a so-called "gateway" cognition, influencing an individual's personal opinions, judgments, attitudes, and affective dispositions toward various social and scientific issues.