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MARCH 2019 I PCB007 MAGAZINE 49 Figure 10: Flow diagram of the process of custom software creation, including VTOC and HIPO documents. • Define a VTOC number for each module • Define a short name describing each module • Attach a description for each module • Put identical modules with same VTOC number and name with a shaded area in the upper right-hand corner HIPO Documents HIPO documents include a set of diagrams that show the functional breakdown of a pro- gram system in hierarchy charts, and sepa- rate diagrams on a hierarchy chart into a set of three boxes showing inputs, processes, and outputs (Figure 12). Figure 11: VTOC chart.