The act of drawing a diagram does not constitute analysis or design. A diagram simply captures a statement of a system’s behaviour (for analysis), or the vision and details of an architecture (for design). If you follow the work of any engineer – software, civil, mechanical, chemical, architectural, or whatever – you will soon realize that the one and only place that a system is conceived is in the mind of the designer. As this design unfolds over time, it is often captured on such high-tech media as white boards, napkins, and the backs of envelopes.