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The material covers finding appropriate classes from use cases and text descriptions, identifying when concepts are out of scope or duplicates, and using examples such as StaffMember. It then details how to name classes uniquely, define attribute types, represent objects with attribute values, and use object diagrams to capture application snapshots, including multiobjects. Finally, it introduces operations signatures and visibility modes (public, protected, private).",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":30,"@type":76,"position":81},"https://docshare.wps.com/document/technology/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/information-systems-analysis-and-design-class-and-object-diagrams/655930/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/information-systems-analysis-and-design-class-and-object-diagrams/655930.png","ImageObject",300,407,{"name":92,"@type":93},"RizkyPratama_92","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-30","2026-10-25",true,{"@type":102,"interactionType":103,"userInteractionCount":19},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"How are classes defined in class diagrams?","Question",{"text":112,"@type":113},"A class describes a group of objects with similar attributes, common behaviour (operations), relationships to other objects, and shared meaning (semantics).","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"What is the recommended way to find classes from use cases or text descriptions?",{"text":117,"@type":113},"Look for nouns and noun phrases in the use case or problem statement, and include them only when they explain the nature or structure of information in the application.",{"name":119,"@type":110,"acceptedAnswer":120},"What do object diagrams represent, and how do multiobjects differ?",{"text":121,"@type":113},"An object diagram shows a set of objects and their interrelationships at a specific point in time, modeling a snapshot of the application. A multiobject represents a set of objects with an undefined number of elements.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},655930,1793095951,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":29,"category_name":30,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":19,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":139,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":144,"read_time":145},962094243231,"https://ap-avatar.wpscdn.com/davatar_155a257f0dc6eb9ab79c44ca47cae57d","Information Systems Analysis and Design CSC340  \nIII. Class and Object Diagrams  \nClasses, Attributes and Operations Objects and Multi-objects  \nGeneralization and Inheritance  \nAssociations and Multiplicity  \nAggregation and Composition  \nHow to Use Class Diagrams  \n© 2001 Jaelson Castro and John Mylopoulos Class Diagrams-- 1  \n\n| Information Systems Analysis and Design | CSC340 |\n| --- | --- |\n| Classes\u003Cbr>􀀁 A class describes a group of objects with\u003Cbr>􀀂 similar properties (attributes),\u003Cbr>􀀂 common behaviour (operations),\u003Cbr>􀀂 common relationships to other objects,\u003Cbr>􀀂 and common meaning (“semantics”) .\u003Cbr>􀀁 For example, “employee: has a name, employee\\# and department; an employee is hired, and fired; an employee works in one or more projects”\u003Cbr>©2003 John Mylopoulos Class Diagrams-- 2 |  |\n\n\n| Information Systems Analysis and Design | CSC340 |\n| --- | --- |\n| Finding Classes\u003Cbr>􀀁 Finding classes in use case, or in text descriptions:\u003Cbr>􀀂 Look for nouns and noun phrases in the description of a use case or a problem statement;\u003Cbr>􀀂 These are only included in the model if they explain the nature or structure of information in the application.\u003Cbr>􀀁 Don’t create classes for concepts which:\u003Cbr>􀀂 Are beyond the scope of the system;\u003Cbr>􀀂 Refer to the system as a whole;\u003Cbr>􀀂 Duplicate other classes;\u003Cbr>􀀂 Are too vague or too specific (few instances);\u003Cbr>􀀁 Finding classes in other sources:\u003Cbr>􀀂 Reviewing background information;\u003Cbr>􀀂 Users and other stakeholders;\u003Cbr>􀀂 Analysis patterns;\u003Cbr>􀀂 CRC (Class Responsibility Collaboration) cards.\u003Cbr>©2003 John Mylopoulos Class Diagrams-- 3 |  |\n\n\n| Information Systems Analysis and Design | CSC340 |  |\n| --- | --- | --- |\n| StaffMember Class for Agate\u003Cbr>􀀁 For example, we may want to represent the concept of a staff member for a company such as Agate in terms of the class\u003Cbr>StaffMember . |  |  |\n| Attributes (optional) | \u003Cbr>StaffMember\u003Cbr>staffName\u003Cbr>CalculateBonus()\u003Cbr>ChangeGrade() |  Name (mandatory)\u003Cbr> Operations (optional)\u003Cbr>|\n| ©2003 John Mylopoulos Class Diagrams-- 4 |  |  |\n\n\n| Information Systems Analysis and Design | CSC340 |\n| --- | --- |\n| Names\u003Cbr>􀀁 Every class must have a unique name\u003Cbr>\u003Cbr>􀀁 Each class has instances that represent particular individuals that have the properties of the class.\u003Cbr>􀀁 For example, George, Nazim, Yijun,… may be instances of StaffMember.\u003Cbr>􀀁 Classes can be used to describe a part of the real world, or part of the system under design.\u003Cbr>©2003 John Mylopoulos Class Diagrams-- 5 |  |\n\n\n| Information Systems Analysis and Design | CSC340 |\n| --- | --- |\n| Attributes\u003Cbr>􀀁 Each class can have attributes w hich represent useful information about instances ofa class.\u003Cbr>􀀁 Each attribute has a type.\u003Cbr>􀀁 For example, Campaign has attributes title and datePaid.\u003Cbr>Campaign title: String\u003Cbr>datePaid: Date\u003Cbr>©2003 John Mylopoulos Class Diagrams-- 6 |  |\n\n\n| Information Systems Analysis and Design | CSC340 |\n| --- | --- |\n| Objects and Their Attribute Values\u003Cbr>􀀁 The instances ofa class are called objects.\u003Cbr>􀀁 Objects are represented as shown below.\u003Cbr>􀀁 Two different objects may have identical attribute values (like two people with identical name and address)\u003Cbr>􀀁 Make sure that attributes are associated with the right class; for example, you don’t want to have both managerName, managerEmp\\# as attributes of Campaign! (... Why??)\u003Cbr>SaveTheKids:Campaign title: “Save the kids”\u003Cbr>datePaid: 28/01/02\u003Cbr>©2003 John Mylopoulos Class Diagrams-- 7 |  |\n\n\n| Information Systems Analysis and Design |  | CSC340 |\n| --- | --- | --- |\n| Object Diagrams\u003Cbr>􀀁 Model the instances of things described by a class.\u003Cbr>􀀁 Each object diagram shows a set of objects and their interrelationships at a point in time.\u003Cbr>􀀁 Used to model a snapshot of the application.\u003Cbr>􀀁 Each object has an optional name and set of classes it is an instance of, also values for attributes of these classes.\u003Cbr>Jaelson:Instructor\u003Cbr>:Student |  |  |\n| BillClinton |  | :Course courseNo: csc340\"\u003Cbr>des","cbCail2eiz50ZhJr","https://ap.wps.com/l/cbCail2eiz50ZhJr","pdf",150609,26,"English","# III. Class and Object Diagrams\n## Classes, Attributes and Operations\n## Generalization and Inheritance\n## Associations and Multiplicity\n## Aggregation and Composition\n## How to Use Class Diagrams\n## Finding Classes\n## Names and Attributes\n## Objects and Attribute Values\n## Object Diagrams and Multiobjects\n## Operations and Signatures\n## Visibility","[{\"question\":\"How are classes defined in class diagrams?\",\"answer\":\"A class describes a group of objects with similar attributes, common behaviour (operations), relationships to other objects, and shared meaning (semantics).\"},{\"question\":\"What is the recommended way to find classes from use cases or text descriptions?\",\"answer\":\"Look for nouns and noun phrases in the use case or problem statement, and include them only when they explain the nature or structure of information in the application.\"},{\"question\":\"What do object diagrams represent, and how do multiobjects differ?\",\"answer\":\"An object diagram shows a set of objects and their interrelationships at a specific point in time, modeling a snapshot of the application. A multiobject represents a set of objects with an undefined number of elements.\"}]","Information Systems Analysis and Design - Class and Object Diagrams | PDF",1792964985,66]