Difference: 'uses', 'extends', 'includes'
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Answer / prasad
"X uses Y" indicates that the task "X" has a subtask "Y";
that is, in the process of completing task "X", task "Y"
will be completed at least once.
"X extends Y" indecates that "X" is a task of the same type
as "Y", but "X" is a special, more specific case of
doing "Y". That is, doing X is a lot like doing Y, but X
has a few extra processes to it that go above and beyond
the things that must be done in order to complete Y.
| Is This Answer Correct ? | 41 Yes | 7 No |
Answer / prakatheesh
The <<include>> relationship means that the flow of that
use case is always included.
But a <<extend>> relationship means that the flow of the
extending use case is only
included under specific conditions, which must be specified
as the extension point of the
use case being extended.
| Is This Answer Correct ? | 32 Yes | 6 No |
Answer / clark
Includes:
if(TRUE)
include the use case
Extends:
if(condition)
extend the use case
It's a matter of unconditional VS. conditional insertion
(Source : Uml 2002--The Unified Modeling Language
By Jean-Marc Jézéquel, Heinrich Hussmann, Stephen Cook)
Uses:
Defined in UML 1.1
| Is This Answer Correct ? | 22 Yes | 13 No |
Answer / naveen sisupalan
If one usecase must use another usecase, then use include
relationship. If one use case may use another usecase, then
use extends relationship. uses relationship is defined in
UML 1.1.
| Is This Answer Correct ? | 34 Yes | 26 No |
Answer / julian c
Include vs extends is nothing to do with 'always' or 'sometimes'. In UML 2.x these are dependency arrow stereotypes.
If the base use case is incomplete... i.e. we can not write, build, test and use it without the linked use case then it is MANDATORY that the other use case exists; this requires and <<include>>. Getting hung up on the always/sometimes issue is counter-productive.
If we can write, build, test and use the base use case without the linked use case existing at all then it is NOT dependent on it; the linked use case however describes how it may add functionality to the base use case - THAT'S WHY THE ARROW IS THE OTHER WAY and is stereotyped <<extend>>. The extending use case is OPTIONAL in that we may or may not provide that functionality at all.
The included use case is like a sub function that is called.
An extend use case can change any aspect of the base use case and in several places. Look at it this way; if I use MSWord to open the base use case, turn on track-changes and then edit it to represent changes I want to make (usually but not limited to additional functionality) the extending use case represents those tracked changes.
<<uses>> is UML 1.x and although still prominent in Visio Use Case stencils (finally fixed in Visio 2013) is deprecated.
| Is This Answer Correct ? | 2 Yes | 0 No |
Answer / sajad ali
Include usecase is shared can be resuse but extend class
relationship can't shared or reuse
| Is This Answer Correct ? | 9 Yes | 8 No |
Answer / hell boy
includes is mandatory
extends is optional
uses is for help
| Is This Answer Correct ? | 17 Yes | 17 No |
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