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4.
Decision
Decision is represented by a diamond shape that has one flow
coming and two or more output flows. Output flows are indicated as
a selection condition.
5.
Merge
Merge is represented by a diamond shape that has two or more
flows coming and one output flow. This combines flows that
previously were divided by selection condition.
6.
Fork
If there are two or more output flows from one input flows, yet they
can be executed without any particular order, activity diagram uses
a black bar to symbolize this process.
7.
Join
In case there are two or more input flows and one output flow and
all input actions should be executed before proceeding to the next
flow of process, activity diagram uses a black bar to symbolize this
process.
8.
Activity Final
In order to finish one activity diagram, a solid circle inside the
hollow circle is needed to symbolize this process.
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