ICOM arrows
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Function
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Side of activity box
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Input
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Consists of objects and/or data a function needs to perform its activities.
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Into left
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Control
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Dictates why and how the function is performed. For example, in a software system a control could be a Software Design Specification
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Downwards into top only
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Call
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When an original function is described in greater detail in another function, the original function “calls” the other function.
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Downwards from bottom
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Output
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Consists of objects and/or data created by the function.
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From the right
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Mechanism
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The means to perform a function also thought of as a resource.
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Upwards into the Activity Box
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