This paper is directed to the use of architectural diagrams. Whenever architectural designers are confronted by a design task the beginning solution process entails a visualization of possible design solutions. The relationship between aspects of the beginning of the design process, the usage of architectural diagrams and the physical building as the final product of the design process is highlighted and discussed from the author’s practical design experience as an trained architect. Significant techniques and categories of architectural diagrams are analyzed and exemplified with respect to their usage in design practice. Finally, two different architectural design methods, namely object-oriented and context-oriented design are characterized and comparatively discussed. The information presented is based on observations, literature, and personal experience in architectural design practice.