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Systems and Enablers architect has used a set of tools to construct the drawing. These include a drawing board, set squares and a pair of compasses along with vari- ous inks, scribes, nibs and quills. These are the primary enablers of the representational media. The second set of enablers serves to connect systems. In this instance they include the graphic scale on the drawings which is a primitive pro- portional enabler, and the material acronyms and other symbolic notations on the drawings, which are early indexical enablers. The authority to construct, an operational enabler, is now literally stamped on the drawing and authorized or wit- nessed. The small scrolls contain more extensive advice on materials and minimum performance standards (Figure 3). The emphasis in this ex- ample is still on the representational although the proportional, aided by a national distributed stan- dard, is somewhat less important. The propor- tional has also become partially connected to the In the aftermath of the industrial revolution, and throughout the early years of the 20 th century, legislation diminished the problems of propor- tional systems, technical standards began to clarify and expand the indexical and management processes associated with tendering and construc- tion grew in complexity and importance. The architectural drawing, now more densely anno- tated and with a conventional graphic and nu- meric scale, remained the primary representa- tional and proportional source. However, because technical and scientific standards had increased the quantity of indexical information required for a design, parallel systems of drawings were re- quired (one for each consultant and for each layer of services) to coordinate multiple levels of information. These were soon supplemented with technical specification documents containing further additional information often associated with minimum standards of workmanship. By the