This chapter considers the “vertical” dimension of relationships: power, dominance, and status. Power is the control of resources, dominance is the exercise of interaction behaviors that gain control, and status is the position on a social hierarchy. Principles of power, dominance, and status can be grouped according to physical potency, resource control, and interaction control. In the physical potency category are indications of threat, size and strength, invigoration, and relaxation. Resource control principles include possession and access to territory, control of other valued resources, and display of task performance cues. Interaction control includes exercising a territorial imperative, regulation of approach and avoidance, adopting positions of centrality and elevation, engaging in initiation, and exercising the prerogative to violate expectations.