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Difference: Activity Diagram and Sequence Diagram.
 Question Submitted By :: UML
I also faced this Question!!     Answer Posted By  
# 1
Activity Diagram mainly represent process flows captured in

Sequence diagram mainly represent interaction between
different objects.It is time ordered means exact
interactions between objects is represented step by step.
Is This Answer Correct ?    75 Yes 9 No
# 2
Sequence diagram describes the behavior of several objects
in a single use case.
activity diagrams are good at showing the general sequence
of actions for several objects and use cases.
Is This Answer Correct ?    37 Yes 8 No
Dharmendra Verma
# 3
In UML Activity diagram is used for functional modeling
while sequence diagram is used to dynamic modeling purpose.

A typical workflow can be repersented by activity diagram
while sequence diagram is more about exploring into use
case by showing intercation between objects.

Note: Activity diagram also repersents an object role in
workflow like sequence diagram but level of repersenation
is not dynamic like sequence diagram repersentation.

for example: Object lifeline and sequence of interaction
is detailed in sequence diagram while activity diagram does
not show such detail about an object.
Is This Answer Correct ?    27 Yes 6 No
Kumar Rohit
# 4
give examples for both of them 
Is This Answer Correct ?    9 Yes 1 No
# 5
activity diagram is not dynamic diagram and it is used to
see the workflow of the software.
And sequence diagram is lifeline of the the object and it
isd dynamic modeling.
Is This Answer Correct ?    9 Yes 8 No
# 6
Both diagrams describe process execution of a system in a
functional way.

Sequence diagram mainly ensures time order for a process.

Activity diagram portrays the execution of a process in
terms of activities performed by the objects.
Is This Answer Correct ?    0 Yes 0 No
Praveen .r

Other UML Interview Questions
  Question Asked @ Answers
Difference: 'uses', 'extends', 'includes' Nobe 3
In the unified process, during which phases is requirement analysis mainly carried out? Oracle 4
What are associative classes? VSNL 2
what is difference between Seqence and Collaboration diagrams with example? TCS 2
What is association? TCS 3
UML: IS it a process, method or notation? Infosys 6
What is the origin of UML?   1
What are the phases of the object-oriented development lifecycle?   2
Difference between Sequence Diagrams, Collaboration Diagrams.   1
What are the tools you used for OOAD? TCS 10
What are the good practices to use while designing for reuse?   1
Does a concept HAVE to become a class in Design?   1
For more UML Interview Questions Click Here 

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