Activity diagram

Acropolis Institute of Technology and
Research
Presentation On:
Activity Diagram
2/19/2015 1
Lokendra Prajapati (MCA) Acropolis
Institute of Technology & Research

What is UML Diagram…?
 UML stands for “Unified Modeling Language”.
 It is a industry-standard graphical language for specifying, visualizing,
constructing and documenting the artifacts of software system.
 The UML uses mostly graphical notation to express the ‘analysis’ and
‘design’ of software projects.
 The UML represent a collection of best engineering practices that are very
helpful in the modeling o large and complex system.
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Why UML for modeling..?
 It is mostly use for simplifies the complex process of software design.
 The UML is very important part of developing object oriented software and
the software development process.
 The UML helps project teams communicate, explore design and validate
the architectural design of the software.
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UML
Structural Behavioral Interaction
Class Diagram Activity Communication
Component State Machine Sequence
Object Use Case Timing
Deployment
Composite Structure
Package
Types of UML
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Activity Diagram…
 Activity diagrams represent the dynamic (behavioral) view of a system.
 Activity diagrams are typically used for business (transaction) process
modeling and modeling the logic captured by a single use-case or usage
scenario.
 Activity diagram is used to represent the flow across use cases or to
represent flow within a particular use case.
 UML activity diagrams are the object oriented equivalent of flow chart and
data flow diagrams in function-oriented design approach.
 Activity diagram contains activities, transitions between activities, decision
points, synchronization bars, swim lanes and many more…
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 Describes how activities are coordinated.
 Is particularly useful when you know that an operation has to achieve a
number of different things, and you want to model what the essential
dependencies between them are, before you decide in what order to do
them.
 Records the dependencies between activities, such as which things can
happen in parallel and what must be finished before something else can
start.
 Represents the workflow of the process.
Activity Diagram…
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1. Activity
 The Core symbol is used for Activities.
 An activity is some task which needs to be done.
 Each activity can be followed by another activity (sequencing).
 An activity may be a manual thing, so that it’s not necessarily in a program.
Activity Diagram…(Notations)
Activity
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2. Transmission (Flow)
 When the action or activity of a state completes, flow of control passes
immediately to the next action or activity state
 The flow of control is shown by arrow symbol.
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3. Starting and Ending Nodes
 The source of flow of control is known as ‘Initial Node or Starting
Node’.
Starting Node(Mark)
 Destination of flow of control is called ‘Ending Node or Final Node’.
Ending Node
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4. Join and Fork
 Join
A block bar with several flows entering in it and one leaving from it. this denotes
the end of parallel activities
 Fork
A black bar ( horizontal/vertical ) with one flow going into it and several leaving it.
This denotes the beginning of parallel activities
4.1 Synch. Bar (Join)
4.2 Splitting Bar (Fork)
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Example for Join and Fork
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5. Decision and Merge
 Decision
– A diamond with one flow entering and
several leaving. The flow leaving
includes conditions as yes/ no state.
 Merge
– A diamond with several flows entering
and one leaving. The implication is that
all incoming flow to reach this point until
processing continues
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6.Flow Finaland Swimlane
 Flow final
– The circle with X though it. This indicates that
Process stop at this point
 Swim lane
– A partition in activity diagram by means of
dashed line, called swim lane. This swim lane
may be horizontal or vertical
– Each zone represents the responsibilities of a
particular class or department
Received form
Payment fees
Hostel
allotment
Issue identity
card
Medical check
Issue library
card
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Difference between Join and Merge
 A join is different from a merge in that the join synchronizes two inflows
and produces a single outflow. The outflow from a join cannot execute until
all inflows have been received
 A merge passes any control flows straight through it. If two or more
inflows are received by a merge symbol, the action pointed to by its
outflow is executed two or more times
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Example of Activity Diagram…
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Example of Activity Diagram…
Fill-in
form
Check
form
[Incorrect]
[Correct]
Display student
screen
Input student
information Search for Student
selection list
Verify the
applications
Regret message
Create record
Regret
registration
[No Match]
[Match]
[Not Found]
[Found]
1
StudentRegistrarSystem
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 Activity diagrams tell you what is happening, but not who does what.
 In domain modelling, this diagram type does not convey which people or
departments are responsible for each activity.
 In programming, it does not convey which class is responsible for each
activity
Drawback of Activity Diagram…
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 Books:
 Software Engineering, A Practitioner’s Approach, By Roger S.
Pressman..
 System Analysis and Design, By Elias M. Awad.
 Web Source:
 www.google.co.in
 www.tutorialspoint.com
 www.slideshare.com
 www.wikipedia.com
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Reference

2/19/2015
19
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Lokendra Prajapati

Activity diagram

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