The scope of this paper is the discussion concerning proper visual adjustment of new architectural objects to their visual context, which is called contextual compatibility (Groat, 1988). Although some general practical rules still remain useful (Brolin, 1980), it is evident that they are not sufficient for solving visual problems in more and more complex contemporary urban environments. Thus, more sophisticated tools should be developed, while basic scientific criteria of objectivity, inter subjective communication, recurrence of results and verifiability must still be fulfilled. This may be achieved by developing a system of notions and thoroughly defined descriptive terms, enabling quantitative descriptions and analyses of visual features (Stamps, 2000). The paper is an attempt at creating such system on the grounds of widely recognized basic notions and terms, yet ordered in a more systematic way.