At work, people observe powerful implicit serial rules about territorial con trol and privacy, analogous to the rules they observe in the residential suburb whore they live. People find out which rules apply in a particular place, and what behavior patterns are appropriate at a given moment, by recognizing the territorial category of the place, and the roles of the individuals i.n it. Every place in the work environrnnt can be categorized as individual territory, group territory, or general territory, and at the same tine as primary or seconder, territory for a particular individual. (Public territories generally lie outside thu work environment.) People at work can know which category of territory they are in when they can recognize the cues and eyrcbols of tern- tonal control that are used by the organization and its staff. Stress and dissatisfaction with the work environment are reduced when the organization's rules for cceu and symbols, for fitting cut end parsenali ring of territory, for control of territorial boundaries, and for frequency of change ore consistent with the implicit social rules follerad by the staff. These concepts were eaed in planning the facilities for an organization of about two thousood people, and in the development of guidelines and critaria for layout end space design. This paper suamarizes these concepts and elements of the planning strategy developed to apply then.