{"id":210,"date":"2014-08-06T02:45:26","date_gmt":"2014-08-06T02:45:26","guid":{"rendered":"http:\/\/www.w3computing.com\/systemsanalysis\/?p=210"},"modified":"2021-04-21T06:32:52","modified_gmt":"2021-04-21T06:32:52","slug":"use-case-relationships","status":"publish","type":"post","link":"https:\/\/www.w3computing.com\/systemsanalysis\/use-case-relationships\/","title":{"rendered":"Use Case Relationships"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Active relationships are referred to as behavioral relationships and are used primarily in use case diagrams. There are four basic types of behavioral relationships: communicates, includes, extends, and generalizes. Notice that all these terms are action verbs. Table below illustrates the arrows and lines used to diagram each of the four types of behavioral relationships. The four relationships are described next.<\/p>\n\n\n<style>\r\r\n\r\r\ntable#t5 {\r\r\n    border-collapse: collapse;\r\r\n\tborder-width: 0px;\r\r\n\tborder-style: outset;\r\r\n    margin: 20px 0;\r\r\n\tborder: 1px solid #6699CC;\r\r\n\tline-height: 2.0em;\r\r\n    text-align: left;\r\r\n    vertical-align: top;width: 100%;box-shadow: 0 2px 3px rgba(0, 0, 0, 0.4);\r\r\n\t\r\r\n}\r\r\ntable#t5 thead tr {\r\r\n\r\r\n}\r\r\ntable#t5 thead tr th.t5 {\r\r\n    color: #6699CC;\r\r\n    letter-spacing: 0;\r\r\n    line-height: 1.5;\r\r\n\tfont-size: 1.2em;\r\r\n    padding: 4px;\r\r\n    text-transform: none;\r\r\n\tborder-bottom: 1px dashed #6699CC;\r\r\n    text-align: left;\r\r\n\t\r\r\n}\r\r\n\r\r\ntable#t5 thead tr th#t5.start {\r\r\n\r\r\n}\r\r\ntable#t5 thead tr th#t5.end {\r\r\n\r\r\n}\r\r\ntable#t5 tbody tr {\r\r\n    background: none repeat scroll 0 0 #FFFFFF;\r\r\n}\r\r\ntable#t5 tbody tr.table-alternate {\r\r\n    background: none repeat scroll 0 0 #FFFFFF;\r\r\n}\r\r\n\r\r\ntable#t5 tbody tr td#n1 {\r\r\n\twidth: 25%;\r\r\n\t}table#t5 tbody tr td#n2 {\r\r\n\twidth: 30%;\r\r\n\t}table#t5 tbody tr td#n3 {\r\r\n\twidth: 50%;\r\r\n\t}\r\r\ntable#t5 tbody tr td {\r\r\n    padding: 5px;\r\r\n\tborder-width: 0px;\r\r\n\tcolor: #666699;\r\r\n\tfont-size: 1.0em;\r\r\n\tborder-top: medium none;border-bottom: 1px solid #C2D6EB;\r\r\n    text-align: left;\r\r\n\tline-height: 1.2;\r\r\n\tvertical-align: top;\r\r\n}\r\r\ntable#t5 tbody tr td.start {\r\r\n\tborder-left: medium none;\r\r\n}\r\r\n\r\r\ntable#t5 tbody tr:hover td {\r\r\n}\r\r\ntable#t5 tfoot tr {\r\r\n}\r\r\n\r\r\ntable#t5 tfoot tr td {\r\r\n\tcolor: #6699CC;\r\r\n\tpadding: 4px;\r\r\n\tborder-width: 0px;\r\r\n\tborder-top: medium none;\r\r\n\tfont-size: 1.0em;\r\r\n    text-align: left;\r\r\n}\r\r\ntable#t5 tfoot tr td.start {\r\r\n\tborder-left: medium none;\r\r\n}\r\r\n\r\r\n<\/style><table id=\"t5\">\r\r\n\t\t<thead>\r\r\n\t\t\t<tr><th scope=\"col\" class=\"t5\" id=\"n1\">Relationship<\/th><th scope=\"col\" class=\"t5\" id=\"n2\">Symbol<\/th><th scope=\"col\" class=\"t5\" id=\"n3\">Meaning<\/th><\/tr><\/thead>\r\r\n\t<tbody><tr class=\"table-alternate row1\"> <td id=\"n1\" class=\"start\">Communicates<\/td><td id=\"n2\" ><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.w3computing.com\/systemsanalysis\/wp-content\/uploads\/2014\/08\/2.13.1.jpg\" width=\"100\" height=\"15\" \/><\/td><td id=\"n3\" >An actor is connected to a use case using a line with no arrowheads.<\/td><\/tr><tr class= \"table-noalt row2\"><td id=\"n1\" class=\"start\">Includes<\/td><td id=\"n2\" ><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.w3computing.com\/systemsanalysis\/wp-content\/uploads\/2014\/08\/2.13.2.jpg\" width=\"100\" height=\"20\" \/><\/td><td id=\"n3\" >A use case contains a behavior that is common to more than one other use case. The arrow points to the common use case.<\/td><\/tr><tr class=\"table-alternate row3\"> <td id=\"n1\" class=\"start\">Extends<\/td><td id=\"n2\" ><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.w3computing.com\/systemsanalysis\/wp-content\/uploads\/2014\/08\/2.13.3.jpg\" width=\"100\" height=\"20\" \/><\/td><td id=\"n3\" >A different use case handles exceptions from the basic use case. The arrow points from the extended to the basic use case.<\/td><\/tr><tr class= \"table-noalt row4\"><td id=\"n1\" class=\"start\">Generalizes<\/td><td id=\"n2\" ><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.w3computing.com\/systemsanalysis\/wp-content\/uploads\/2014\/08\/2.13.4.jpg\" width=\"100\" height=\"20\" \/><\/td><td id=\"n3\" >One UML \"thing\" is more general than another \"thing.\" The arrow points to the general \"thing.\"<\/td><\/tr><\/tbody><\/table>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>COMMUNICATES<\/strong>. The behavioral relationship communicates is used to connect an actor to a use case. Remember that the task of the use case is to give some sort of result that is beneficial to the actor in the system. Therefore, it is important to document these relationships between actors and use cases. In our first example, a Student communicates with Enroll in Course. Examples of some components of a student enrollment example are shown in the use case diagrams in the figure below.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>INCLUDES<\/strong>. The includes relationship (also called uses relationship) describes the situation in which a use case contains behavior that is common to more than one use case. In other words, the common use case is included in the other use cases. A dotted arrow that points to the common use case indicates the includes relationship. An example would be a use case Pay Student Fees that is included in Enroll in Course and Arrange Housing, because in both cases students must pay their fees. This may be used by several use cases. The arrow points toward the common use case.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>EXTENDS<\/strong>. The extends relationship describes the situation in which one use case possesses the behavior that allows the new use case to handle a variation or exception from the basic use case. For&nbsp; example, the extended use case Student Health Insurance extends the basic use case Pay Student Fees. The arrow goes from the extended to the basic use case.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>GENERALIZES<\/strong>. The generalizes relationship implies that one thing is more typical than the other thing. This relationship may exist between two actors or two use cases. For example, a Part-Time Student generalizes a Student. Similarly, some of the university employees are professors. The arrow points to the general thing.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><a href=\"http:\/\/www.w3computing.com\/systemsanalysis\/wp-content\/uploads\/2014\/08\/2.14.jpg\" rel=\"noopener\" rel=\"lightbox[210]\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"218\" src=\"http:\/\/www.w3computing.com\/systemsanalysis\/wp-content\/uploads\/2014\/08\/2.14-300x218.jpg\" alt=\"Examples of use cases and behavioral relationships for student enrollment.\" class=\"wp-image-218\" srcset=\"https:\/\/www.w3computing.com\/systemsanalysis\/wp-content\/uploads\/2014\/08\/2.14-300x218.jpg 300w, https:\/\/www.w3computing.com\/systemsanalysis\/wp-content\/uploads\/2014\/08\/2.14-1024x744.jpg 1024w, https:\/\/www.w3computing.com\/systemsanalysis\/wp-content\/uploads\/2014\/08\/2.14.jpg 1063w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><figcaption>Examples of use cases and behavioral relationships for student enrollment.<\/figcaption><\/figure><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Developing System Scope<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The scope of a system defines its boundaries, what is in scope\u2014or inside the system\u2014and what is out of scope. The project usually has a budget that helps to define scope, and a start and end time. Actors are always outside the scope of the system. The communicates lines that connect actors to the use cases are the boundaries, and define the scope. Since a use case diagram is created early in the systems life cycle, the budget, starting time, and ending time may change as the project progresses; as the analyst learns more about the system, the use case diagrams, use case, and scope may change.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Active relationships are referred to as behavioral relationships and are used primarily in use case diagrams. There are four basic types of behavioral relationships: communicates, includes, extends, and generalizes. Notice that all these terms are action verbs. Table below illustrates the arrows and lines used to diagram each of the four types of behavioral relationships. [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[5],"tags":[],"class_list":["post-210","post","type-post","status-publish","format-standard","category-understanding-modeling-organizational-systems","entry","has-post-thumbnail"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Use Case Relationships<\/title>\n<meta name=\"description\" content=\"Active relationships are referred to as behavioral relationships and are used primarily in use case diagrams. 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