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The activity diagram it describes a single activity of the system or it specifies the various activities of the system?
Can there be more than one start in the activity diagram? Ex: Starts an activity with an ordinary user but also starts an activity with a special user.
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The activity diagram describes the sequence of activities involving software, showing from the user’s actions to the completion of software functions.
In the above example I describe a simple diagram of a rental company’s activity using rental registration software, in which I follow since the action of an actor request the lease, proceeding with the steps that superficially describe the functions of the software with decision points generally referred to the actor.
So to sum up, the activity diagram describes all the functionality of the software describing the activities that lead up to its execution and to the completion of its execution. (In the above example "Request allocation" is not referring to the software itself, but rather to the employees of the rental company, usually along with the activity diagram a table describing each functionality better.
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The activity diagram can have more than one beginning and more than one ending. It describes the execution flow of a specific system activity and may cover another activity as long as that second activity is necessary for the execution of the first.
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The activity diagram represents the flow of one activity to another, is a flow diagram.
According to my knowledge it is not possible to have more than one start, what there may be is two flows one waiting for the other to start, but can not start parallel.
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