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The document defines use-case realization as a design perspective element supporting separate management from its use case, using dependencies such as “realizes”. It details sequence diagrams with explicit chronological message sequences and lifelines, contrasts them with communications (collaboration) diagrams for object-effect understanding and algorithm design, and summarizes key diagram properties and typical contents, including object and actor instances.","# Interactions Diagrams\n\nObject InteractionsSequence DiagramsCommunication(Collaboration)Diagrams  \nExamples  \n# Use Case Realization\n\n\n| Use-Case  \u003Cbr>Realization   | A use-case realization describes how  \u003Cbr>a particular use case is realized within  \u003Cbr>the design mode,in terms of  \u003Cbr>collaborating objects.   |\n| --- | --- |\n\nA Use-Case Realization represents the Design perspective of a UseCase.The reason for separating the Use-Case Realization from itsUse Case is that doing so allows the Use Cases to be managedseparately from their realizations.  \n# For each Use Case-One Realization\n\nFor each use case in the use-case model,there is a use-caserealization in the design model with a dependency (stereotyped\u003C\u003Crealizes>>)to the use case.  \n# The Use-CaSe Model\n\nThe Design iodel  \nU9e C    eUse Case Realization  \nUse case realization is an organization model element used togroup a number of artifacts related to the design of a use case:  \n● Class diagrams of participating classes and subsystems,and  \n● Interaction diagrams which illustrate the flow of events of a usecase,performed by a set of class and subsystem instances.  \n# Interaction Diagrams\n\nFor each use-case realization there is one or more interactiondiagrams depicting its participating objects and their interactions.There are two types of interaction diagrams:  \n1,Sequence diagrams -show the explicit sequence ofmessages and are better for real-time specifications and forcomplex scenarios;  \n2,Communications (prior UML 2.0-collaboration)diagrams -show the communication links between objectsand are better for understanding all of the effects on a givenobject and for algorithm design.  \n# Kept in a Picture\n\nUse Case Realization  \nClass DiagramsInteraction DiagramsSequenceCommuni-DiagramscationDiagrams  \nModels and views in UML 1.5  \n\n|  | Use case  \u003Cbr>view   | Logical  \u003Cbr>view   | Implem entat  \u003Cbr>ion  \u003Cbr>view   | Process  \u003Cbr>view   | Deployment  \u003Cbr>view   |\n| --- | --- | --- | --- | --- | --- |\n| Use case  \u003Cbr>diagram   | YES   |  |  |  |  |\n| Class diagram   |  | YES   |  |  |  |\n|  |  |  |  |  |  |\n| Sequence  \u003Cbr>diagram   | YES   | YES   |  |  |  |\n| Collaboration  \u003Cbr>diagram   | YES   | YES   |  | YES   |  |\n| Statechart  \u003Cbr>diagram   | YES   | YES   |  | YES   |  |\n| Component  \u003Cbr>diagram   |  |  | YES   | YES   | YES   |\n| Deployment  \u003Cbr>diagram   |  |  |  |  | YES   |\n\n# Sequence Diagram-Definition\n\n\n| Sequence  \u003Cbr>Diagram   | A sequence diagram describes a pattern  \u003Cbr>of interaction among objects,arranged in a  \u003Cbr>chronologica order.   |\n| --- | --- |\n\n\n|  |\n| --- |\n\n# Properties of\n\nSequence Diagrams  \n·Sequence diagrams show the objects participating in the interactionby their \"lifelines\"and the messages that they send to each other,  \ni.e.how objects interact to perform the behavior of a use case.  \n·Sequence diagrams are particularly important to designers becausethey clarify the roles of objects in a flow and thus provide basicinput for determining class responsibilities and interfaces.  \n·Unlike a communication(before UML 2.0-collaboration)diagram,asequence diagram includes chronological sequences (explicitsequence of messages),but does not include object relationships.  \n# Contents of Sequence Diagrams\n\nYou can have:  \nobjects(i.e.class instances)  \nand  \nactor instances  \nin sequence diagrams,together with messagesdescribing how they interact.  \nThe diagram describes what takes place in the  \nparticipating objects,in terms of activations,and howthe objects communicate by sending messages.  \n# Example of Sequence Diagram\n\n:A-subscriber  \n:AHandler  \n:Network Handling :B Handler :B-subscriber  \n   \n   \n   \n   \n   \nReceive first digitTurn off the dial toneReceive the rest ofthe digits  \nNotify the B handlerIf the B-subscriberis found,mark itbusy and connectA and B to networkSet ring tone on for  \nA,and ring signalon for B","cbCaimwz0GiKW1cF","https://ap.wps.com/l/cbCaimwz0GiKW1cF","pdf",2363681,54,"English","en",105,"# Interactions Diagrams\n## Use Case Realization\n## For each Use Case-One Realization\n## The Use-Case Model\n## Interaction Diagrams\n## Sequence Diagram-Definition\n## Properties of Sequence Diagrams\n## Contents of Sequence Diagrams\n## Example of Sequence Diagram","[{\"question\":\"What does a use-case realization describe in the UML design perspective?\",\"answer\":\"A use-case realization describes how a particular use case is realized within the design mode, based on collaborating objects. It supports managing use cases separately from their realizations.\"},{\"question\":\"How do sequence diagrams differ from communication diagrams (collaboration diagrams)?\",\"answer\":\"Sequence diagrams show the explicit chronological sequence of messages and clarify object roles in a flow. Communication diagrams show communication links and are better for understanding all effects on an object and for algorithm design.\"},{\"question\":\"What elements are included in a UML sequence diagram?\",\"answer\":\"A sequence diagram can include objects (class instances) and actor instances, along with messages describing how they interact. It depicts activations and how objects communicate by sending messages.\"}]","Interactions Diagrams - Use Case Realization - Sequence and Communication Diagrams | PDF",1792963517,136,{"code":4,"msg":82,"data":83},"ok",{"site_id":75,"language":74,"slug":84,"title":65,"keywords":85,"description":66,"schema_data":86,"social_meta":140,"head_meta":142,"extra_data":144,"updated_unix":145},"interactions-diagrams-use-case-realization-sequence-and-communication-diagrams","",{"@graph":87,"@context":139},[88,102,122],{"@type":89,"itemListElement":90},"BreadcrumbList",[91,95,97,100],{"item":92,"name":93,"@type":94,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":96,"name":9,"@type":94,"position":14},"https://docshare.wps.com/document/",{"item":98,"name":30,"@type":94,"position":99},"https://docshare.wps.com/document/technology/",3,{"item":101,"name":65,"@type":94,"position":19},"https://docshare.wps.com/document/interactions-diagrams-use-case-realization-sequence-and-communication-diagrams/655735/",{"url":101,"name":65,"@type":103,"image":104,"author":109,"headline":65,"publisher":111,"fileFormat":114,"inLanguage":74,"description":66,"dateModified":115,"datePublished":116,"encodingFormat":114,"isAccessibleForFree":117,"interactionStatistic":118},"DigitalDocument",{"url":105,"@type":106,"width":107,"height":108},"https://docshare.wps.com/thumbnails/interactions-diagrams-use-case-realization-sequence-and-communication-diagrams/655735.png","ImageObject",300,407,{"name":63,"@type":110},"Person",{"url":92,"name":112,"@type":113},"DocShare","Organization","application/pdf","2026-10-29","2026-10-25",true,{"@type":119,"interactionType":120,"userInteractionCount":19},"InteractionCounter",{"@type":121},"ViewAction",{"@type":123,"mainEntity":124},"FAQPage",[125,131,135],{"name":126,"@type":127,"acceptedAnswer":128},"What does a use-case realization describe in the UML design perspective?","Question",{"text":129,"@type":130},"A use-case realization describes how a particular use case is realized within the design mode, based on collaborating objects. It supports managing use cases separately from their realizations.","Answer",{"name":132,"@type":127,"acceptedAnswer":133},"How do sequence diagrams differ from communication diagrams (collaboration diagrams)?",{"text":134,"@type":130},"Sequence diagrams show the explicit chronological sequence of messages and clarify object roles in a flow. Communication diagrams show communication links and are better for understanding all effects on an object and for algorithm design.",{"name":136,"@type":127,"acceptedAnswer":137},"What elements are included in a UML sequence diagram?",{"text":138,"@type":130},"A sequence diagram can include objects (class instances) and actor instances, along with messages describing how they interact. 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