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diff --git a/usth/ICT2.7/P2L2 OO Software Engineering and UML Subtitles/30 - Use Case Diagram: Creation Tips - lang_en_vs5.srt b/usth/ICT2.7/P2L2 OO Software Engineering and UML Subtitles/30 - Use Case Diagram: Creation Tips - lang_en_vs5.srt new file mode 100644 index 0000000..ccf7d0e --- /dev/null +++ b/usth/ICT2.7/P2L2 OO Software Engineering and UML Subtitles/30 - Use Case Diagram: Creation Tips - lang_en_vs5.srt @@ -0,0 +1,127 @@ +1 +00:00:00,080 --> 00:00:02,190 +Now, as we did for the class diagram, let's look at + +2 +00:00:02,190 --> 00:00:05,440 +some creation tips for use case diagrams. The first tip is that + +3 +00:00:05,440 --> 00:00:09,050 +when you define a use case, use a name that communicates purpose. + +4 +00:00:09,050 --> 00:00:12,080 +It should be clear what the use case refers to by just + +5 +00:00:12,080 --> 00:00:14,320 +looking at the name of the use case. Second tip is + +6 +00:00:14,320 --> 00:00:17,700 +to define one atomic behavior per use case. So try not to + +7 +00:00:17,700 --> 00:00:21,900 +put more than one specific scenario into a use case. Why? Because + +8 +00:00:21,900 --> 00:00:25,380 +these will make the use cases easier to understand and better suited + +9 +00:00:25,380 --> 00:00:28,940 +for their roles that we just discussed to define test cases, + +10 +00:00:28,940 --> 00:00:31,370 +to do planning, to define an architecture and so on and + +11 +00:00:31,370 --> 00:00:34,790 +so forth. Define the flow of events clearly. So again, do + +12 +00:00:34,790 --> 00:00:37,820 +it from the perspective of an outsider. An outsider should be able + +13 +00:00:37,820 --> 00:00:40,390 +to read the description of the flow of events and understand + +14 +00:00:40,390 --> 00:00:43,770 +exactly how the system works or how that specific piece of + +15 +00:00:43,770 --> 00:00:47,572 +functionality works. As we suggested for the class diagram, provide only + +16 +00:00:47,572 --> 00:00:50,450 +essential details. So there is no need to provide all the nitty + +17 +00:00:50,450 --> 00:00:53,720 +gritty details about the use case, just provide enough details so + +18 +00:00:53,720 --> 00:00:57,540 +that the use case is complete and understandable. And finally, even + +19 +00:00:57,540 --> 00:00:59,960 +though we didn't cover that, there is a way to factor + +20 +00:00:59,960 --> 00:01:03,890 +common behaviors and factor variants when defining use cases. So I will + +21 +00:01:03,890 --> 00:01:06,580 +encourage you to look at how to do that. For example, + +22 +00:01:06,580 --> 00:01:09,290 +by looking at the additional UML documentation and to try to + +23 +00:01:09,290 --> 00:01:12,875 +factor out this common behaviors and variants. Typical example would be + +24 +00:01:12,875 --> 00:01:15,550 +a system that requires login, like the one that we just discussed, + +25 +00:01:15,550 --> 00:01:18,350 +will probably require an initial login step for each use + +26 +00:01:18,350 --> 00:01:22,080 +case. It is possible that instead of describing the same steps, + +27 +00:01:22,080 --> 00:01:24,600 +or same sub-steps, for each use case, you can factor + +28 +00:01:24,600 --> 00:01:26,740 +that out. And create a use case that you should then + +29 +00:01:26,740 --> 00:01:29,180 +include in your own use cases. As I said, we + +30 +00:01:29,180 --> 00:01:32,790 +didn't cover this for simplicity, but feel free to further read + +31 +00:01:32,790 --> 00:01:35,450 +about UML and to see how you can actually factor out + +32 +00:01:35,450 --> 00:01:38,890 +behaviors and factor variants. Which can be very useful in practice. |