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diff --git a/usth/ICT2.7/P2L1 Requirements Engineering Subtitles/24 - Elicitation Problems - lang_en_vs4.srt b/usth/ICT2.7/P2L1 Requirements Engineering Subtitles/24 - Elicitation Problems - lang_en_vs4.srt deleted file mode 100644 index 2d81db7..0000000 --- a/usth/ICT2.7/P2L1 Requirements Engineering Subtitles/24 - Elicitation Problems - lang_en_vs4.srt +++ /dev/null @@ -1,179 +0,0 @@ -1 -00:00:00,190 --> 00:00:03,440 -Unfortunately, extracting requirements from these sources is not - -2 -00:00:03,440 --> 00:00:06,220 -a straightforward task, as there are many issues involved - -3 -00:00:06,220 --> 00:00:09,470 -with the requirements elicitation. One first problem is the - -4 -00:00:09,470 --> 00:00:13,930 -thin spread of domain knowledge. Knowledge is rarely available - -5 -00:00:13,930 --> 00:00:15,970 -in an explicit form, that is, it is - -6 -00:00:15,970 --> 00:00:20,310 -almost never written down. Moreover, knowledge is often distributed - -7 -00:00:20,310 --> 00:00:23,410 -across many sources. For example, in the graphical depiction - -8 -00:00:23,410 --> 00:00:25,590 -here, to find out that this is the purpose - -9 -00:00:25,590 --> 00:00:28,240 -of the project. The developer, the analyist, needs to talk - -10 -00:00:28,240 --> 00:00:30,870 -to a lot of different people. And, to make things even - -11 -00:00:30,870 --> 00:00:34,400 -worse. There are often conflicts between the knowledge gathered from - -12 -00:00:34,400 --> 00:00:37,610 -different sources. A second issue is the fact that the knowledge - -13 -00:00:37,610 --> 00:00:41,090 -is often tacit. What is also called the say, do - -14 -00:00:41,090 --> 00:00:44,052 -problem. In the example shown here. For instance. We have a - -15 -00:00:44,052 --> 00:00:47,650 -customer that is describing to the analyst. The way in which - -16 -00:00:47,650 --> 00:00:51,060 -he accomplishes a task. So it performs these three steps and - -17 -00:00:51,060 --> 00:00:54,300 -reaches the goal. Whereas in practice, the actual way in - -18 -00:00:54,300 --> 00:00:57,530 -which this task accomplished is by going through a larger number - -19 -00:00:57,530 --> 00:00:59,880 -of steps to get to the same goal. So the point - -20 -00:00:59,880 --> 00:01:02,650 -here is that, even if the knowledge were more concentrated, so - -21 -00:01:02,650 --> 00:01:05,660 -not as spread as in this example. People simply find - -22 -00:01:05,660 --> 00:01:08,680 -it hard to describe knowledge that they regularly use. So it - -23 -00:01:08,680 --> 00:01:11,740 -is hard to make this knowledge explicit, to pass this knowledge - -24 -00:01:11,740 --> 00:01:13,130 -to someone else. Yet another - -25 -00:01:13,130 --> 00:01:16,690 -problem is limited observability. Identifying requirements - -26 -00:01:16,690 --> 00:01:20,570 -through observation is often difficult as the problem owners might be - -27 -00:01:20,570 --> 00:01:23,550 -too busy to perform the task that we need to observe. - -28 -00:01:23,550 --> 00:01:25,750 -Or they might be doing a lot of other things together - -29 -00:01:25,750 --> 00:01:27,980 -with the task that we need to observe, so that becomes - -30 -00:01:27,980 --> 00:01:31,530 -confusing. That introduces noise. Moreover, even when this is not the - -31 -00:01:31,530 --> 00:01:34,460 -case, the presence of an observer might change their problem. It - -32 -00:01:34,460 --> 00:01:38,020 -is very typical for human subjects to improve or modify an - -33 -00:01:38,020 --> 00:01:41,760 -aspect of their behavior, which is being experimentally measured in response - -34 -00:01:41,760 --> 00:01:44,110 -to the fact that they know that they're being studied. You know - -35 -00:01:44,110 --> 00:01:47,110 -that somebody's studying you and you change the way in which you behave. - -36 -00:01:47,110 --> 00:01:50,910 -A typical issue. Finally, the information that we collect might be biased. - -37 -00:01:50,910 --> 00:01:54,270 -For several reasons. People might not feel free to tell you what you - -38 -00:01:54,270 --> 00:01:57,030 -need to know. Or, people might not want to tell you what - -39 -00:01:57,030 --> 00:02:00,240 -you need to know. For example, in all the common cases in which - -40 -00:02:00,240 --> 00:02:03,870 -the outcome might effect them, people might provide you a different picture - -41 -00:02:03,870 --> 00:02:06,770 -from the real one. In order to influence you. So, they might have - -42 -00:02:06,770 --> 00:02:08,820 -a hidden agenda, and mislead you, either - -43 -00:02:08,820 --> 00:02:11,860 -consciously or unconsciously. So, all these issues - -44 -00:02:11,860 --> 00:02:14,370 -add to the complexity of collecting requirements, - -45 -00:02:14,370 --> 00:02:16,522 -of identifying the purpose of a system. |