[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-656133-105":59,"doc-detail-656133-en":130},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":123,"head_meta":125,"extra_data":127,"updated_unix":129},105,"en","data-flow-diagram-with-examples-customer-service-system-tutorial","Data Flow Diagram with Examples-Customer Service System - Tutorial","","Tutorial content explains how to construct and read a Data Flow Diagram (DFD) using a Customer Service System (CS System) example. It introduces the hierarchy of DFD levels—Context (level zero), Level-1, and possible Level-2—then walks through entities, processes, and data flows. The example covers persistent versus transient versus manual data types using D, T, and M, and discusses practical guidance such as choosing appropriate data detail and avoiding diagram scope errors.",{"@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/data-flow-diagram-with-examples-customer-service-system-tutorial/656133/",{"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/data-flow-diagram-with-examples-customer-service-system-tutorial/656133.png","ImageObject",300,407,{"name":92,"@type":93},"Asher","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-30","2026-10-25",true,{"@type":102,"interactionType":103,"userInteractionCount":29},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What are the main levels in a Data Flow Diagram (DFD) according to the tutorial?","Question",{"text":112,"@type":113},"The tutorial describes a hierarchy consisting of a Context Diagram (conceptually level zero), a Level-1 DFD, and possibly Level-2 DFDs and further levels based on system complexity.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"Which external entities interact with the CS System in the example?",{"text":117,"@type":113},"The context diagram includes external entities such as CS Assistant and Passenger that exchange information with the CS System process through data flows.",{"name":119,"@type":110,"acceptedAnswer":120},"What do the data type letters D, T, and M represent in a DFD?",{"text":121,"@type":113},"D represents persistent computerized data, T represents transient data held for a short time, and M represents manual data stored without using a computer (with a variant T(M) for manual transient data).","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},656133,1793137271,{"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":29,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":19,"language":139,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":67,"update_tm":143,"read_time":52},687197207639,"https://ap-avatar.wpscdn.com/davatar_a8503ba1806abce46bf441b54a3ca4cd","Visual Paradigm  \nData Flow Diagram with Examples-Customer Service System  \nTutorial  \nData Flow Diagram with Examples-Customer Service System  \nWritten Date : February 16, 2015  \nThe CS System Example  \nThe data flow diagram is a hierarchy of diagrams that consists of:  \n1. Context Diagram (conceptually level zero)  \n2. The Level-1 DFD  \n3. And possible Level-2 DFD and further levels of functional decomposition, depending on the complexity of your system  \nContext DFD  \nThe figure below shows a context Data Flow Diagram that is drawn for a railway company's Customer Service System. It contains a process (shape) that represents the system to be modeled, in this case, the \" CS System.\" It also shows the participants who will interact with the system, called the external entities. In this example, CS Assistant and Passenger are the two entities who will interact with the system. In between the process and the external entities, there are data flows (connectors) that indicate the existence of information exchange between the entities and the system.  \nA Context DFD is the entrance of a data flow model. It contains one and only one process and does not show any data stores.  \nLevel 1 DFD  \nThe figure below shows the level 1 DFD, which is the decomposition (i.e. , breakdown) of the CS System process shown in the context DFD. Read through the diagram, and then we will introduce some of the key concepts based on this diagram.  \n[https://www.visual-paradigm.com/tutorials/data-flow-diagram-example-cs-system.jsp](https://www.visual-paradigm.com/tutorials/data-flow-diagram-example-cs-system.jsp) Page 1 of 4  \nVisual Paradigm  \nData Flow Diagram with Examples-Customer Service System  \nTutorial  \nThe CS System Data Flow Diagram example contains four processes, two external entities, and four data stores. Although there are no design guidelines that govern the positioning of shapes in a Data Flow Diagram, we tend to put the processes in the middle and the data stores and external entities on the sides to make it easier to comprehend.  \nBased on the diagram, we know that a Passenger can receive Transport details from the Inquiry Transport Details process, and the details are provided by the data stores Transport Details and Railway Live Statistic. While the data stored in Transport Details is persistent data (indicated by the label \"D\"), the data stored in Railway Live Statistic is transient data that is held for a short time (indicated by the label \"T\") . A callout shape is used to list the kind of details that can be inquired about by a passenger.  \nThe CS Assistant can initiate the Buy Souvenir process, which will result in the Order details being stored in the Order data store. Although the customer is the real person who buys the souvenir, it is the CS Assistant who accesses the system to store the order details. Therefore, we make the data flow from the CS Assistant to the Buy Souvenir process.  \nThe CS Assistant can also initiate the Buy Ticket process by providing Order details, and the details will be stored again in the Order data store. A Data Flow Diagram is a high-level diagram that is drawn with a high degree of abstraction. The \"Order\" data store drawn here does not necessarily imply a real order database or order table in a database. The way order details are stored physically is to be decided later on when implementing the system.  \nFinally, the CS Assistant can initiate the Report Lost process by providing the Incident and item details, and the information will be stored in the Lost Item database.  \nData Flow Diagram Tips and Cautions  \n[https://www.visual-paradigm.com/tutorials/data-flow-diagram-example-cs-system.jsp](https://www.visual-paradigm.com/tutorials/data-flow-diagram-example-cs-system.jsp) Page 2 of 4  \nVisual Paradigm  \nData Flow Diagram with Examples-Customer Service System  \nTutorial  \nStating the Type of Data with D, M, and T  \nEach data store drawn in a Data Flow Diagram is prefixed by a letter, which is 'D'","cbCairAWNzTOCwUC","https://ap.wps.com/l/cbCairAWNzTOCwUC","pdf",213685,"English","# Data Flow Diagram with Examples-Customer Service System\n## Context DFD\n## Level 1 DFD\n## Stating the Type of Data with D, M, and T\n## Be Aware of the Level of Detail\n## Don't Overdraw\n## Don't Mix Up Data Flow and Process Flow","[{\"question\":\"What are the main levels in a Data Flow Diagram (DFD) according to the tutorial?\",\"answer\":\"The tutorial describes a hierarchy consisting of a Context Diagram (conceptually level zero), a Level-1 DFD, and possibly Level-2 DFDs and further levels based on system complexity.\"},{\"question\":\"Which external entities interact with the CS System in the example?\",\"answer\":\"The context diagram includes external entities such as CS Assistant and Passenger that exchange information with the CS System process through data flows.\"},{\"question\":\"What do the data type letters D, T, and M represent in a DFD?\",\"answer\":\"D represents persistent computerized data, T represents transient data held for a short time, and M represents manual data stored without using a computer (with a variant T(M) for manual transient data).\"}]","Data Flow Diagram with Examples-Customer Service System - Tutorial | PDF",1792966617]