From b2d80610db6beda38573890ed169815e495bc663 Mon Sep 17 00:00:00 2001
From: Nguyễn Gia Phong <mcsinyx@disroot.org>
Date: Sun, 24 May 2020 16:34:31 +0700
Subject: [usth/ICT2.7] Engineer software

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+1
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+Now that we saw what the main values and practices
+
+2
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+of XP are, I want to go back for a minute
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+3
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+to discussion of requirements engineering in XP. In XP, user
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+4
+00:00:08,800 --> 00:00:12,180
+requirements are expressed as scenarios or user stories, as we already
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+5
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+discussed. These are written by customers on cards, and what
+
+6
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+the development team does is to take these cards, take these
+
+7
+00:00:18,550 --> 00:00:22,240
+users stories and break them down into implementation tasks. And
+
+8
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+those implementation tasks are then used as a basis for scheduling
+
+9
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+cost estimates. So given these estimates, and based on their priorities,
+
+10
+00:00:29,210 --> 00:00:31,770
+the customer will choose the stories that will be included in
+
+11
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+the next release, in the next iteration. And at this point,
+
+12
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+the corresponding cards will be taken by the developers and the,
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+00:00:39,220 --> 00:00:42,380
+the task will be performed, and the relative, and the corresponding
+
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+card will be developed. And just to give an idea of
+
+15
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+the order of magnitude, if you consider a few months project,
+
+16
+00:00:47,330 --> 00:00:50,390
+there might be 50 to 100 user stories for a project of
+
+17
+00:00:50,390 --> 00:00:52,820
+that duration. So, now let me give you an example of what
+
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+the story card might look like, and I'm going to do it using
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+19
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+a story card for document downloading and you can really do all of
+
+20
+00:00:58,930 --> 00:01:00,780
+this, basically as seeing what the
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+21
+00:01:00,780 --> 00:01:03,440
+scenario is, downloading and printing an article.
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+00:01:03,440 --> 00:01:06,590
+And it describes basically what happens when you do that, what is
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+00:01:06,590 --> 00:01:09,530
+the scenario. First, you select the article that you want from a displayed
+
+24
+00:01:09,530 --> 00:01:12,760
+list. You then have to tell the system how you will pay for
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+25
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+it. This can either be through a subscription, through a company account or
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+26
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+by credit card, and so on. So what developers do, they take
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+this story card, and they break it down in to development tasks.
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+So, here I'm showing you some examples of task cards for the
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+29
+00:01:25,100 --> 00:01:28,360
+user story that we just saw. In particular I'm showing three task cards
+
+30
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+and if we look at the third one, there is a name
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+for the task, which is implement payment collection. So this is the development
+
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+task that we have the perform and here, there's a description of
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+what that developed code should do. And notice that, you know, the task
+
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+card can even be more. explicit than this, more
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+specific than this, and talk about actual development tasks.
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