All Internal Activities should have the same size in height and width. If a bigger size is needed, the respective size should be a multiple of a pre-defined basic size. There is no magic figure for the number of functions/chart. The priority is readability and this requires a clear layout of activities and associated connectivity. Off-page hierarchy (“Create Sub-Chart”) should be used to maintain readability.
Internal Activities should be placed one below the other thus enabling the reader to reveal the dynamics of the system by reading the chart “top-to-bottom” and “left-to-right.”
The name of the top-level activity should be identical with the chart name.