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 Posted: Tue Apr 17, 2007 1:52 pm Post subject: Describing Use-case: What are the different between Trigger, |
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Hi all,
I'm a 3rd year student and I'm learning about use-case specification.
Can you help me to make it clear about the difference between
- Trigger
- Precondition
- Postcondition
Some example might help me alot
Thank in advance |
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Phlip
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| Posted: Tue Apr 17, 2007 6:11 pm Post subject: Re: Describing Use-case: What are the different between Trig |
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lyhoanghai wrote:
| Quote: |
I'm a 3rd year student and I'm learning about use-case specification.
Can you help me to make it clear about the difference between
- Trigger
- Precondition
- Postcondition
Some example might help me alot
|
What did your textbook say about them? What did Google and WikiPedia say
about them?
--
Phlip
http://flea.sourceforge.net/PiglegToo_1.html |
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H. S. Lahman
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| Posted: Tue Apr 17, 2007 7:00 pm Post subject: Re: Describing Use-case: What are the different between Trig |
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Responding to Lyhoanghai...
| Quote: |
I'm a 3rd year student and I'm learning about use-case specification.
Can you help me to make it clear about the difference between
- Trigger
- Precondition
- Postcondition
Some example might help me alot
|
Well, it's refreshing that you admit you are a student. However, these
are very basic things that any course on use cases should have defined.
It isn't the purpose of these forums to do your homework for you. Doing
your own assignments is part of the learning process.
*************
There is nothing wrong with me that could
not be cured by a capful of Drano.
H. S. Lahman
hsl@pathfindermda.com
Pathfinder Solutions
http://www.pathfindermda.com
blog: http://pathfinderpeople.blogs.com/hslahman
"Model-Based Translation: The Next Step in Agile Development". Email
info@pathfindermda.com for your copy.
Pathfinder is hiring:
http://www.pathfindermda.com/about_us/careers_pos3.php.
(888)OOA-PATH |
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Mister UML
Guest
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| Posted: Thu Apr 19, 2007 8:04 am Post subject: Re: Describing Use-case: What are the different between Trig |
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On Apr 17, 11:00 am, "H. S. Lahman" <h.lah...@verizon.net> wrote:
| Quote: |
Responding to Lyhoanghai...
I'm a 3rd year student and I'm learning about use-case specification.
Can you help me to make it clear about the difference between
- Trigger
- Precondition
- Postcondition
Some example might help me alot
Well, it's refreshing that you admit you are a student. However, these
are very basic things that any course on use cases should have defined.
It isn't the purpose of these forums to do your homework for you. Doing
your own assignments is part of the learning process.
*************
There is nothing wrong with me that could
not be cured by a capful of Drano.
H. S. Lahman
h...@pathfindermda.com
Pathfinder Solutionshttp://www.pathfindermda.com
blog:http://pathfinderpeople.blogs.com/hslahman
"Model-Based Translation: The Next Step in Agile Development". Email
i...@pathfindermda.com for your copy.
Pathfinder is hiring:http://www.pathfindermda.com/about_us/careers_pos3.php.
(888)OOA-PATH
|
Come on, people. Wikipedia on use cases? Really.
A trigger is something that happens to cause the given use case to be
executed. I like to use amazon.com as an example when I'm teaching
process; in that context, for example, when a customer wants to check
out, but he hasn't logged on yet, whatever use case is handling "check
out" would pass control to whatever use case is handling "log on,"
since you can't check out without the system knowing who you are. In
that case, we could specify "the customer is logged in" as a
precondition for "check out" to work--a precondition is a condition
that must be true in order for a use case to proceed--and the
postcondition of the "log in" use case--a condition that must hold
true when a use case has finished---would be "the customer has logged
in." Now, people, would you find THAT kind of explanation in
Wikipedia, exactly?
Kendall Scott
kendallvscott@optonline.net |
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j.w.knop@ieee.org
Guest
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| Posted: Wed Apr 25, 2007 6:25 pm Post subject: Re: Describing Use-case: What are the different between Trig |
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| Quote: |
Come on, people. Wikipedia on use cases? Really.
A trigger is something that happens to cause the given use case to be
executed. I like to use amazon.com as an example when I'm teaching
process; in that context, for example, when a customer wants to check
out, but he hasn't logged on yet, whatever use case is handling "check
out" would pass control to whatever use case is handling "log on,"
since you can't check out without the system knowing who you are. In
that case, we could specify "the customer is logged in" as a
precondition for "check out" to work--a precondition is a condition
that must be true in order for a use case to proceed--and the
postcondition of the "log in" use case--a condition that must hold
true when a use case has finished---would be "the customer has logged
in." Now, people, would you find THAT kind of explanation in
Wikipedia, exactly?
Kendall Scott
kendallvsc...@optonline.net- Tekst uit oorspronkelijk bericht niet weergeven -
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Kendall,
I would like to invite you to have a look at http://en.wikipedia.org/wiki/Use_case.
And as I do like your description of the example, add it to the Wiki.
But as far as I'm concerned the basic's is there in this wiki,
including reference to some of the best textbooks on the subject.
Regards,
Jan Willem |
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Hai Ly-Hoang
Guest
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| Posted: Fri Apr 27, 2007 12:46 am Post subject: Re: Describing Use-case: What are the different between Trig |
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I found that the following description in Wikipedia about
Postcondition:
"Postconditions
The post-conditions section summarizes the state of affairs after the
scenario is complete. A scenario guarantees that its post-conditions
are true at the end of the scenario."
The explanation is quite easy to understand. However, how about a real-
life example of Postcondition? |
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