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In page Anxiety/uncertainty management:

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Gudykunst states that in generating the axioms for the theory he assumed that managing anxiety and uncertainty are “basic causes” influencing effective communication. Other variables (e.g. self-concepts, motivation, reactions to strangers, social categorization, situational processes, connections with strangers, ethical interactions, anxiety, uncertainty, mindfulness and effective communication), are treated as "superficial causes" of effective communication. The influence of these “superficial causes” on effective communication is mediated through anxiety and uncertainty. Being mindful allows us to engage in anxiety and uncertainty management.