As soon as the reader is then introduced to a detailed presentation of parts of the system (supply and use tables, sector accounts, etc.), the relation of the detailed submatrices to the aggregate matrix should be clear through a system of codes.
Ko je bralcu nato predstavljen podrobnejši prikaz delov sistema (tabele ponudbe in porabe, sektorski računi ipd), mora biti povezava podrobnih podmatrik z agregatno matriko jasna skozi sistem oznak.