An activity node diagram is used to visually represent the sequence of activities in a process. It helps to show the flow of tasks, decisions, and interactions within a system. By using nodes to represent activities and connecting them with arrows to show the order of execution, the diagram provides a clear and organized way to understand the steps involved in a process. This visual representation can help stakeholders identify bottlenecks, optimize workflows, and improve efficiency in a process.
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The executing process group overlaps... Activity in the executing process group starts off slowly...
The purpose of the activity diagram is to model the procedural flow of actions that are part of a larger activity. In projects in which use cases are present, activity diagrams can model a specific use case at a more detailed level. However, activity diagrams can be used independently of use cases for modeling a business-level function, such as buying a concert ticket or registering for a college class. Activity diagrams can also be used to model system-level functions, such as how a ticket reservation data mart populates a corporate sales system's data warehouse. Because it models procedural flow, the activity diagram focuses on the action sequence of execution and the conditions that trigger or guard those actions. The activity diagram is also focused only on the activity's internal actions and not on the actions that call the activity in their process flow or that trigger the activity according to some event (e.g., it's 12:30 on April 13th , and Green Day tickets are now on sale for the group's Copyright Rational Software 2003 http://www.therationaledge.com/content/sep_03/f_umlbasics_db.jspsummer tour). Although UML sequence diagrams can protray the same information as activity diagrams, I personally find activity diagrams best for modeling business-level functions. This is because activity diagrams show all potential sequence flows in an activity, whereas a sequence diagram typically shows only one flow of an activity. In addition, business managers and business process personnel seem to prefer activity diagrams over sequence diagrams -- an activity diagram is less "techie" in appearance, and therefore less intimidating to business people. Besides, business managers are used to seeing flow diagrams, so the "look" of an activity diagram is familiar. (reference by http://www.ibm.com/developerworks/rational/library/content/RationalEdge/sep03/f_umlbasics_db.pdf)
The Monitoring and Controlling processes take place throughout the project lifecycle The Monitoring and Controlling process group shows the most activity in the middle of the project lifecycle, when the Executing process group activities are approaching their peak
Activity in the Executing process group starts off slowly, at teh very beginning of the project life cycle THe Executing process group overlaps all the other process groups
An activity is a sub-set of process. For example, new business process in Insurance industry can comprise of activities such as Application Data Entry, Underwriting, and Policy Issuance. Whereas an event is an occurrence or an outcome which is of significance, and based on which typically, a business rule can be triggered. For a example, an event could be start of an activity, end of an activity, non completion of an activity within a certain timeframe, etc.