{"id":536,"date":"2022-01-26T01:30:24","date_gmt":"2022-01-26T01:30:24","guid":{"rendered":"https:\/\/www.cybermedian.com\/pl\/?p=536"},"modified":"2025-02-17T11:42:50","modified_gmt":"2025-02-17T03:42:50","slug":"a-simple-guide-to-use-case-analysis","status":"publish","type":"post","link":"https:\/\/www.cybermedian.com\/pl\/a-simple-guide-to-use-case-analysis\/","title":{"rendered":"Prosty przewodnik po analizie przypadk\u00f3w u\u017cycia"},"content":{"rendered":"<section class=\"section section--body section--first\">\n<div class=\"section-content\">\n<div class=\"section-inner sectionLayout--insetColumn\">\n<h3 class=\"graf graf--h3 graf-after--h3\" id=\"c382\">Czym jest analiza przypadk\u00f3w u\u017cycia?<\/h3>\n<p class=\"graf graf--p graf-after--h3\" id=\"bd65\">Diagramy przypadk\u00f3w u\u017cycia s\u0105 g\u0142\u00f3wnie u\u017cywane do opisywania r\u00f3l oraz po\u0142\u0105cze\u0144 mi\u0119dzy rolami a przypadkami u\u017cycia. Wyja\u015bnij, kto b\u0119dzie korzysta\u0142 z systemu i co mog\u0105 z nim zrobi\u0107.<\/p>\n<p class=\"graf graf--p graf-after--p\" id=\"8b8f\">Diagram przypadk\u00f3w u\u017cycia zawiera wiele element\u00f3w modelu, takich jak systemy, uczestnicy i przypadki u\u017cycia, oraz pokazuje r\u00f3\u017cne relacje mi\u0119dzy tymi elementami, takie jak generalizacja, asocjacja i zale\u017cno\u015b\u0107.<\/p>\n<p class=\"graf graf--p graf-after--p\" id=\"a18f\">Pokazuje diagram modelu funkcjonalnego systemu, kt\u00f3ry mo\u017ce by\u0107 obserwowany przez zewn\u0119trznego u\u017cytkownika. Przypadki u\u017cycia pomagaj\u0105 zespo\u0142owi deweloperskiemu zrozumie\u0107 funkcjonalne wymagania systemu w spos\u00f3b wizualny.<\/p>\n<h3 class=\"graf graf--h3 graf-after--p\" id=\"0014\">Elementy diagramu przypadk\u00f3w u\u017cycia<\/h3>\n<p class=\"graf graf--p graf-after--h3\" id=\"3194\">Diagram przypadk\u00f3w u\u017cycia zawiera 6 element\u00f3w, a mianowicie<\/p>\n<ul class=\"postList\">\n<li class=\"graf graf--li graf-after--p\" id=\"407f\">Aktor<\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"9d8e\">Przypadki u\u017cycia<\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"cac5\">Asocjacja<\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"8ea6\">Relacje include<\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"0fe8\">Relacje rozszerzone (Extend)<\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"407d\">Relacja generalizacji<\/li>\n<\/ul>\n<figure class=\"graf graf--figure graf-after--li\" id=\"a955\"><img class=\"graf-image\" data-height=\"571\" data-image-id=\"0*m7B63ztiMQ7B6Q9u.png\" data-is-featured=\"true\" data-width=\"792\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/pl\/wp-content\/uploads\/sites\/16\/2022\/01\/0m7B63ztiMQ7B6Q9u.png\"\/><\/figure>\n<p class=\"graf graf--p graf-after--figure\" id=\"fe73\">Alternatywnie, mo\u017cesz umie\u015bci\u0107 granice systemu w diagramie przypadk\u00f3w u\u017cycia, aby wskaza\u0107 zakres systemu.<\/p>\n<h3 class=\"graf graf--h3 graf-after--p\" id=\"d89b\">Aktor<\/h3>\n<p class=\"graf graf--p graf-after--h3\" id=\"a5ee\">Jakie s\u0105 role, kt\u00f3re korzystaj\u0105 z tego systemu? R\u00f3\u017cne role korzystaj\u0105 z r\u00f3\u017cnych funkcji systemu, kt\u00f3re s\u0105 reprezentowane przez aktor\u00f3w w diagramie przypadk\u00f3w u\u017cycia.<\/p>\n<ul class=\"postList\">\n<li class=\"graf graf--li graf-after--p\" id=\"586e\">Zewn\u0119trzny podmiot<\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"a79b\">Uczestniczy\u0107 w procesie realizacji przypadk\u00f3w u\u017cycia<\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"0075\">Aktorzy s\u0105 reprezentowani przez role, kt\u00f3re odgrywaj\u0105 w uczestnictwie w przypadku u\u017cycia<\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"668f\">Ka\u017cdy aktor mo\u017ce uczestniczy\u0107 w jednym lub wi\u0119cej przypadkach u\u017cycia<\/li>\n<\/ul>\n<h4 class=\"graf graf--h4 graf-after--li\" id=\"b146\">Rodzaje aktora<\/h4>\n<ol class=\"postList\">\n<li class=\"graf graf--li graf-after--h4\" id=\"de1f\">U\u017cytkownicy systemu &#8211; rzeczywi\u015bci ludzie, u\u017cytkownicy, s\u0105 najcz\u0119stszymi aktorami, kt\u00f3rzy istniej\u0105 w prawie ka\u017cdym systemie, i powinni by\u0107 nazywani zgodnie z rolami<br \/>\nInne systemy, kt\u00f3re wchodz\u0105 w interakcj\u0119 z budowanym systemem<\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"345b\">Program zewn\u0119trzny &#8211; Przyk\u0142ad, gdy klient nie zwr\u00f3ci\u0142 samochodu w czasie zwrotu, system przypomni przedstawicielowi obs\u0142ugi klienta, aby zadzwoni\u0142 do klienta, a czas lub zewn\u0119trzny system staje si\u0119 uczestnikiem systemu<\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"76fb\">Inne obejmuj\u0105 urz\u0105dzenia sprz\u0119towe, us\u0142ugi zewn\u0119trzne i zewn\u0119trzne bazy danych<\/li>\n<\/ol>\n<h4 class=\"graf graf--h4 graf-after--li\" id=\"36a8\">Jak znale\u017a\u0107 uczestnik\u00f3w systemu?<\/h4>\n<ul class=\"postList\">\n<li class=\"graf graf--li graf-after--h4\" id=\"eebc\">Kto b\u0119dzie korzysta\u0142 z g\u0142\u00f3wnych funkcji systemu<\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"5efb\">Kto b\u0119dzie potrzebowa\u0142 wsparcia systemu, aby wykona\u0107 swoj\u0105 prac\u0119<\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"7a73\">Kto b\u0119dzie musia\u0142 utrzymywa\u0107 i zarz\u0105dza\u0107 systemem<\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"b2d6\">Jakie urz\u0105dzenia sprz\u0119towe system musi obs\u0142ugiwa\u0107<\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"be52\">Z jakim systemem ten system wchodzi w interakcj\u0119<\/li>\n<\/ul>\n<h4 class=\"graf graf--h4 graf-after--li\" id=\"3480\">Inicjator i wspieraj\u0105cy<\/h4>\n<ul class=\"postList\">\n<li class=\"graf graf--li graf-after--h4\" id=\"6c81\">Kto lub jaki system jest zainteresowany wynikami generowanymi przez ten system<\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"4174\">Inicjator jest g\u0142\u00f3wnym obiektem us\u0142ugi przypadku u\u017cycia<br \/>\nInny to uczestnik, kt\u00f3ry odgrywa rol\u0119 wspieraj\u0105cego<\/li>\n<\/ul>\n<h4 class=\"graf graf--h4 graf-after--li\" id=\"ab6b\">Relacja mi\u0119dzy przypadkami u\u017cycia<\/h4>\n<p class=\"graf graf--p graf-after--h4\" id=\"2fed\">Relacja asocjacji (reprezentuje relacj\u0119 mi\u0119dzy uczestnikami a przypadkami u\u017cycia. W UML cz\u0119sto jest reprezentowana przez prost\u0105 lini\u0119 lub lini\u0119 z strza\u0142k\u0105 wskazuj\u0105c\u0105 na odbiorc\u0119 informacji)<\/p>\n<figure class=\"graf graf--figure graf-after--p\" id=\"bcfa\"><img class=\"graf-image\" data-height=\"360\" data-image-id=\"0*66Yxwp_16_fpiKjhlpk.png\" data-width=\"616\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/pl\/wp-content\/uploads\/sites\/16\/2022\/01\/066Yxwp_16_fpiKjhlpk.png\"\/><\/figure>\n<h4 class=\"graf graf--h4 graf-after--figure\" id=\"e65d\">Strukturyzacja przypadk\u00f3w u\u017cycia z relacjami<\/h4>\n<p class=\"graf graf--p graf-after--h4\" id=\"28ab\">Relacja Extend \/ rozszerzenia (oznacza, \u017ce nowe zachowania s\u0105 dodawane do istniej\u0105cych przypadk\u00f3w u\u017cycia w okre\u015blonych warunkach. Uzyskane nowe przypadki u\u017cycia nazywane s\u0105 rozszerzonymi przypadkami u\u017cycia, a oryginalne przypadki u\u017cycia nazywane s\u0105 podstawowymi przypadkami u\u017cycia, co odpowiada zapewnieniu dodatkowej funkcji dla podstawowych przypadk\u00f3w u\u017cycia. Jest reprezentowana przez przerywane linie z strza\u0142kami w UML, a strza\u0142ki wskazuj\u0105 na podstawowe przypadki u\u017cycia)<\/p>\n<p class=\"graf graf--p graf-after--p\" id=\"6783\">Relacja include (oznacza, \u017ce zachowanie innych przypadk\u00f3w u\u017cycia mo\u017ce by\u0107 po prostu w\u0142\u0105czone, a zachowanie przypadku u\u017cycia zawarte w nim mo\u017cna traktowa\u0107 jako cz\u0119\u015b\u0107 jego w\u0142asnego zachowania. Cz\u0119sto jest reprezentowane przez przerywane linie z strza\u0142kami w UML, a strza\u0142ki wskazuj\u0105 na w\u0142\u0105czone przypadki u\u017cycia)<\/p>\n<p class=\"graf graf--p graf-after--p\" id=\"3d20\">Relacja generalizacji (odnosi si\u0119 do tego, \u017ce rodzicielski przypadek u\u017cycia mo\u017ce by\u0107 specjalizowany, aby utworzy\u0107 wiele dzieci\u0119cych przypadk\u00f3w u\u017cycia, a relacja mi\u0119dzy rodzicielskimi przypadkami u\u017cycia a dzieci\u0119cymi przypadkami u\u017cycia to relacja generalizacji. W UML jest reprezentowana przez solidn\u0105 lini\u0119 z pust\u0105 tr\u00f3jk\u0105tn\u0105 strza\u0142k\u0105, a strza\u0142ka wskazuje na rodzicielski przypadek u\u017cycia)<\/p>\n<figure class=\"graf graf--figure graf-after--p\" id=\"4a03\"><img class=\"graf-image\" data-height=\"417\" data-image-id=\"0*GRRJlhZGRVm2rUYt.png\" data-width=\"913\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/pl\/wp-content\/uploads\/sites\/16\/2022\/01\/0GRRJlhZGRVm2rUYt.png\"\/><\/figure>\n<h3 class=\"graf graf--h3 graf-after--figure\" id=\"5741\">Przyk\u0142ady przypadk\u00f3w u\u017cycia<\/h3>\n<p class=\"graf graf--p graf-after--h3\" id=\"4c7e\">Tutaj wybieram kilka przyk\u0142ad\u00f3w z Visual Paradigm Online, kt\u00f3re powinny by\u0107 ci dobrze znane w kontek\u015bcie biznesowym, takich jak bankomat, DMS i system zam\u00f3wie\u0144. Rysunek poni\u017cej pokazuje<strong class=\"markup--strong markup--p-strong\">bankomat<\/strong> przyk\u0142ad diagramu przypadk\u00f3w u\u017cycia, kt\u00f3ry jest do\u015b\u0107 klasycznym przyk\u0142adem do wykorzystania w nauczaniu diagramu przypadk\u00f3w u\u017cycia.<\/p>\n<figure class=\"graf graf--figure graf-after--p\" id=\"397a\"><img class=\"graf-image\" data-height=\"457\" data-image-id=\"0*790CZa6jLBEayDAa.png\" data-width=\"495\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/pl\/wp-content\/uploads\/sites\/16\/2022\/01\/0790CZa6jLBEayDAa.png\"\/><\/figure>\n<p class=\"graf graf--p graf-after--figure\" id=\"0af5\">Dokument<strong class=\"markup--strong markup--p-strong\">Zarz\u0105dzania Dokumentami (DMS)<\/strong> przyk\u0142ad diagramu przypadk\u00f3w u\u017cycia poni\u017cej pokazuje aktor\u00f3w i przypadki u\u017cycia systemu. W szczeg\u00f3lno\u015bci wyst\u0119puj\u0105 relacje include i extend mi\u0119dzy przypadkami u\u017cycia.<\/p>\n<figure class=\"graf graf--figure graf-after--p\" id=\"37ae\"><img class=\"graf-image\" data-height=\"452\" data-image-id=\"0*sjW9G8QbjOtpwOZt.png\" data-width=\"625\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/pl\/wp-content\/uploads\/sites\/16\/2022\/01\/0sjW9G8QbjOtpwOZt.png\"\/><\/figure>\n<p class=\"graf graf--p graf-after--figure\" id=\"fef1\">System<strong class=\"markup--strong markup--p-strong\">Zam\u00f3wie\u0144<\/strong>Przyk\u0142ad diagramu przypadk\u00f3w u\u017cycia poni\u017cej pokazuje aktor\u00f3w i przypadki u\u017cycia zaanga\u017cowane w system:<\/p>\n<figure class=\"graf graf--figure graf-after--p graf--trailing\" id=\"a04a\"><img class=\"graf-image\" data-height=\"325\" data-image-id=\"0*iavH6O7Ipi9X-O1y.png\" data-width=\"711\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/pl\/wp-content\/uploads\/sites\/16\/2022\/01\/0iavH6O7Ipi9X-O1y.png\"\/><\/figure>\n<\/div>\n<\/div>\n<\/section>\n<section class=\"section section--body section--last\">\n<div class=\"section-divider\">\n<hr class=\"section-divider\"\/>\n<\/div>\n<div class=\"section-content\">\n<div class=\"section-inner sectionLayout--insetColumn\">\n<h3 class=\"graf graf--h3 graf--leading\" id=\"13a7\">Poznaj inne diagramy UML i pokrewne artyku\u0142y<\/h3>\n<ul class=\"postList\">\n<li class=\"graf graf--li graf-after--h3\" id=\"42f0\"><a class=\"markup--anchor markup--li-anchor\" data-href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/why-uml-modeling\/\" href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/why-uml-modeling\/\" rel=\"noopener\" target=\"_blank\">Dlaczego modelowanie UML?<\/a><\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"e9e9\"><a class=\"markup--anchor markup--li-anchor\" data-href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/overview-of-the-14-uml-diagram-types\/\" href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/overview-of-the-14-uml-diagram-types\/\" rel=\"noopener\" target=\"_blank\">Przegl\u0105d 14 typ\u00f3w diagram\u00f3w UML<\/a><\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"71e9\"><a class=\"markup--anchor markup--li-anchor\" data-href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-class-diagram\/\" href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-class-diagram\/\" rel=\"noopener\" target=\"_blank\">Czym jest diagram klas?<\/a><\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"b710\"><a class=\"markup--anchor markup--li-anchor\" data-href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-component-diagram\/\" href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-component-diagram\/\" rel=\"noopener\" target=\"_blank\">Czym jest diagram komponent\u00f3w?<\/a><\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"9898\"><a class=\"markup--anchor markup--li-anchor\" data-href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-deployment-diagram\/\" href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-deployment-diagram\/\" rel=\"noopener\" target=\"_blank\">Czym jest diagram wdro\u017cenia?<\/a><\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"0e7f\"><a class=\"markup--anchor markup--li-anchor\" data-href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-object-diagram\/\" href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-object-diagram\/\" rel=\"noopener\" target=\"_blank\">Czym jest diagram obiekt\u00f3w?<\/a><\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"9712\"><a class=\"markup--anchor markup--li-anchor\" data-href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-package-diagram\/\" href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-package-diagram\/\" rel=\"noopener\" target=\"_blank\">Czym jest diagram pakiet\u00f3w?<\/a><\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"75c2\"><a class=\"markup--anchor markup--li-anchor\" data-href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-composite-structure-diagram\/\" href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-composite-structure-diagram\/\" rel=\"noopener\" target=\"_blank\">Czym jest diagram struktury z\u0142o\u017conej?<\/a><\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"f524\"><a class=\"markup--anchor markup--li-anchor\" data-href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-profile-diagram\/\" href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-profile-diagram\/\" rel=\"noopener\" target=\"_blank\">Czym jest diagram profilu?<\/a><\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"07f1\"><a class=\"markup--anchor markup--li-anchor\" data-href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-use-case-diagram\/\" href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-use-case-diagram\/\" rel=\"noopener\" target=\"_blank\">Czym jest diagram przypadk\u00f3w u\u017cycia?<\/a><\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"bc6a\"><a class=\"markup--anchor markup--li-anchor\" data-href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-activity-diagram\/\" href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-activity-diagram\/\" rel=\"noopener\" target=\"_blank\">Czym jest diagram aktywno\u015bci?<\/a><\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"5746\"><a class=\"markup--anchor markup--li-anchor\" data-href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-state-machine-diagram\/\" href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-state-machine-diagram\/\" rel=\"noopener\" target=\"_blank\">Czym jest diagram maszyny stanowej?<\/a><\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"ccc3\"><a class=\"markup--anchor markup--li-anchor\" data-href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-sequence-diagram\/\" href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-sequence-diagram\/\" rel=\"noopener\" target=\"_blank\">Czym jest diagram sekwencji?<\/a><\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"a5e5\"><a class=\"markup--anchor markup--li-anchor\" data-href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-communication-diagram\/\" href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-communication-diagram\/\" rel=\"noopener\" target=\"_blank\">Czym jest diagram komunikacji?<\/a><\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"6459\"><a class=\"markup--anchor markup--li-anchor\" data-href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-interaction-overview-diagram\/\" href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-interaction-overview-diagram\/\" rel=\"noopener\" target=\"_blank\">Czym jest diagram przegl\u0105du interakcji?<\/a><\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"7578\"><a class=\"markup--anchor markup--li-anchor\" data-href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-timing-diagram\/\" href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-timing-diagram\/\" rel=\"noopener\" target=\"_blank\">Czym jest diagram czasowy<\/a><\/li>\n<li class=\"graf graf--li graf-after--li graf--trailing\" id=\"2ec9\"><a class=\"markup--anchor markup--li-anchor\" data-href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-uml-collaboration-diagram\/\" href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-uml-collaboration-diagram\/\" rel=\"noopener\" target=\"_blank\">Czym jest diagram wsp\u00f3\u0142pracy UML?<\/a><\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/section>\n","protected":false},"excerpt":{"rendered":"<p>Use case modeling is a technique for capturing, modeling, and specifying system requirements that correspond to a set of behaviors that the system may perform when interacting with actors. These behaviors produce observable results and help achieve their goals. 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