ICOM codes and changing arrow roles Note

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This encoding identifies the arrow on the parent block as an input, control signal, output, or mechanism. The letter is followed by a number indicating the relative position of the arrow connected to the parent block, numbered left to right or top to bottom. For example, the entry “C3” on a boundary arrow on a child diagram indicates that this arrow corresponds to the third control arrow (from left to right) entering the parent block. This encoding links each child diagram to its own immediate parent block. When the blocks in a child diagram are detailed in subsequent child diagrams, each new child diagram assigns new ICOM codes that link the boundary arrows of that diagram to the arrows on its own immediate parent block.

Sometimes the letter ICOM codes that define the albania whatsapp number data roles of the boundary arrows (input, control, mechanism) may change when moving from a parent block to a child diagram. Figure 14 shows a common case where the roles do match, for example, the input of the parent block is the same as the input of the child diagram. As an example of changing roles, a control arrow in a parent block may be an input in a child diagram. Likewise, an input of a parent block may be a control for one or more child blocks. Figure 15 shows examples of changing arrow roles.

The dashed lines show the relationship between the boundary arrows and the parent block arrows. 3.3.2.9 Tunneling arrows A tunneling arrow is used to provide information at a particular decomposition level that is not required for analysis at some other levels. An arrow can be tunneled at any level chosen. A tunneling arrow is indicated by parentheses at the beginning and/or end of the arrow (see Figure 16). Tunneling means that the data or objects expressed by these arrows are not considered in the parent diagram and/or the child diagram and are not required at the next level of decomposition.