Architecture has always been practiced. Even in ancient times master-builders (design) buildings and (manage) their construction. Up until the late 80ies draughtspersons (spend) their working hours at drawing boards using tee squares, compasses and stencils. In 1938, Konrad Zuse (invent) the Z1 – the first digital computer. The first CAD programmes (appear) in the 70ies, however, they (not become) affordable for smaller offices until the early 90ies. Nowadays, most architects (sit) in front of flat screens and (give) instructions to the computer by clicking the mouse. Despite all the changes, architects (still use) paper and pencil to jot down first thoughts.