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Activity Diagram

Activity Diagram

An activity diagram visually presents a series of actions or flow of control in a system similar to flow chart or a data flow diagram.

An activity diagram is drawn to model how the system should function in order to achieve Business Logic, Business Functionality and Business Objectives.

Activity diagram used in BPM (Business Process Modelling). Activity diagram clearly displays   flow of a control which is mentioned in USECASE diagram.

Activity Diagram helps developers to understand in a clear manner of requirement in a UML (Unified Modelling Language). Activity diagram is the dynamic view of UML. An operation of the system can be described with help of activity diagram. Activity diagram used to construct the executable system by using forward and reverse engineering techniques

MS VISIO is used to draw Activity Diagram and which is drag and drop method

In activity diagram there were few drawing elements

: Indicates where work flow will starts

: Arrow showing direction of workflow. Generally, control flow will start from top to

Bottom and from left to right

: Indicates steps in the process. It is the unit of work done by the system or a

Consistent state achieved

:  Indicates a choice. Workflow will proceed along one of a number of possible

Paths, according to the guard conditions

: Indicates where work flow will end

: A condition attached to control flow. When the guard condition is true,

Workflow may flow along the control flow. Guard conditions are usually

Attached to control flows that came out of a decision symbol. A guard

Condition shown within square brackets

: An event must occur for the flow to

Move along the control flow. Event is externally triggered

Or it can be a consistent point of a defined time frame

: Between a branch and Merge, we can have many number of paths. For the

Control to pass from branch to merge at least minimum one path should

Execute.

Eg: Payment by cash, card, net banking coupons

: Between a Fork and Join, we can have n number of paths. For the control to

Pass from Fork to join all the paths should execute. The condition between

The paths will be “AND”

Eg: Cash withdrawal from ATM

Nested Loop Activity:  This is an activity wherein this activity may contains series of activities

Internally

Connector: A Connector has multiple inputs and multiple outputs. Practically we use

Connectors for 1- many and many – 1

Continuation Node: If activity is big and is spanning pages. We give continuity from one page

Through another page by using continuation nodes. It can also be used to

Connect extreme left to right sides in a page or for reusability of a

Particular flow

Few Important Points related to Activity Diagram:

  • Activity Diagrams can be drawn as below levels like
    • Project wise, module wise, department wise, functionality wise, use case wise
  • Activity Diagrams can be drawn based on frequency
    • Setup, 1 Time, Annual, Half-yearly, Quarterly, Monthly, Weekly, Daily, Predefined frequency and adhoc basis- specific to an initiative
  • We can draw multiple activity diagrams for a single case study where as it will be only one case diagram
  • If we are drawing multiple activity diagrams for a single case study every diagram should have a heading based on level and time frequency

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