[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-seo-657616-105":3,"detail-sidebar-cat-0-en-105":81,"doc-detail-657616-en":130},{"code":4,"msg":5,"data":6},0,"ok",{"site_id":7,"language":8,"slug":9,"title":10,"keywords":11,"description":12,"schema_data":13,"social_meta":74,"head_meta":76,"extra_data":78,"updated_unix":80},105,"en","3-struct-analys-fnctnal-design-of-iis-p2-dfd-ii-diagrams","3 - Struct Analys Fnctnal Design-of IIS - p2 - DFD - ii - Diagrams","","This chapter covers structured analysis and functional architecture design for Industrial Information Systems, focusing on Data Flow Diagrams (DFD) and their diagramming rules. It introduces core DFD concepts including context diagrams, level-0 DFDs, and the hierarchical principle of functional decomposition. It explains how context-level boundaries and information flows are preserved across decomposition levels and how additional data stores may be introduced at more detailed stages. 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It continues until no sub-process can be further logically broken down; the lowest level is a primitive DFD.","Answer",{"name":66,"@type":61,"acceptedAnswer":67},"What does a context diagram include in DFD methodology?",{"text":68,"@type":64},"A context diagram contains only one process symbol (labeled O) and does not show data stores. It includes the overall process scope plus sources/sinks (external entities) and major information flows between them.",{"name":70,"@type":61,"acceptedAnswer":71},"How is information maintained when decomposing from context level to level-0 and further?",{"text":72,"@type":64},"Boundary relationships and the data flows present at the context level are preserved at each successive decomposition level, so flows from sources to sinks also appear in the level-0 DFD. Further decomposition may introduce additional data stores needed for deeper understanding.","https://schema.org",{"og:url":32,"og:type":75,"og:title":10,"og:site_name":45,"og:description":12},"article",{"robots":77,"canonical":32},"index,follow",{"doc_id":79,"site_id":7},657616,1793074510,{"code":4,"msg":82,"data":83},"success",[84,88,92,96,100,105,110,114,119,122,126],{"id":22,"doc_module":4,"doc_module_name":25,"category_name":85,"show_sort_weight":86,"slug":87},"Story & Novel",90,"story-novel",{"id":26,"doc_module":4,"doc_module_name":25,"category_name":89,"show_sort_weight":90,"slug":91},"Literature",80,"literature",{"id":33,"doc_module":4,"doc_module_name":25,"category_name":93,"show_sort_weight":94,"slug":95},"Exam",70,"exam",{"id":55,"doc_module":4,"doc_module_name":25,"category_name":97,"show_sort_weight":98,"slug":99},"Comic",60,"comic",{"id":101,"doc_module":4,"doc_module_name":25,"category_name":102,"show_sort_weight":103,"slug":104},6,"Technology",50,"technology",{"id":106,"doc_module":4,"doc_module_name":25,"category_name":107,"show_sort_weight":108,"slug":109},7,"Healthcare",40,"healthcare",{"id":111,"doc_module":4,"doc_module_name":25,"category_name":29,"show_sort_weight":112,"slug":113},8,30,"research-report",{"id":115,"doc_module":4,"doc_module_name":25,"category_name":116,"show_sort_weight":117,"slug":118},9,"Religion & Spirituality",20,"religion-spirituality",{"id":117,"doc_module":4,"doc_module_name":25,"category_name":120,"show_sort_weight":117,"slug":121},"World Cup","world-cup",{"id":123,"doc_module":4,"doc_module_name":25,"category_name":124,"show_sort_weight":123,"slug":125},10,"Lifestyle","lifestyle",{"id":127,"doc_module":4,"doc_module_name":25,"category_name":128,"show_sort_weight":55,"slug":129},19,"General","general",{"code":4,"msg":82,"data":131},{"doc_id":79,"user_id":132,"nickname":42,"user_avatar":133,"doc_module":4,"category_id":111,"category_name":29,"doc_title":10,"doc_description":12,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":55,"is_deleted":4,"is_public":22,"is_downloadable":22,"audit_status":22,"page_count":139,"language":140,"language_code":8,"site_id":7,"html_lang":8,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":12,"update_tm":144,"read_time":145},962090760408,"https://ap-avatar.wpscdn.com/davatar_085a072bc5b1113ac321206ff7593b45","King Saud University  \nCollege of Engineering  \n# IE-462:“Industrial Information Systems”\n\nFall-2023(1st Sem.1445H)Chapter 4:  \nStructured Analysis and FunctionalArchitecture Design-p2-DFD-ii-Diagrams  \nPrepared by:Ahmed M.EI-Sherbeeny,PhD  \n## Lesson Overview\n\n·Modeling IIS-(p1)  \n·Integrated Computer-Aided Manufacturing  \nDefinition 0(IDEFO)-(p1)  \n·Data Flow Diagram(DFD)-(p2)  \ni.  Fundamentals  \nii.Diagramming Rulesiii.Case Studies  \n## DFD-part ii-Diagramming Rules\n\n·Context Diagram  \n● level-0 DFD  \n·Data Flow Diagramming Rules  \n·Decomposition of DFDs  \n·Food Ordering System Summary  \n·Balancing DFDs  \n·Guidelines for Drawing DFDs  \n## Functional/Process Modeling:\n\n2.Data Flow Diagram(DFD)-cont'd  \n## Context Diagram\n\n## Functional Decomposition\n\n·Functional decomposition:an iterative process ofbreaking a system description down into finer andfiner details:  \no Creates a set of hierarchically related charts in which oneprocess on a given chart is explained in greater detail onanother chart  \no Continues until no sub-process can logically be brokendown any further  \no Lowest level of a DFD is called a primitive DFD  \nTABLE 7-1 Deliverables for Process Modeling  \n1.Context DFD  \n2.DFDs of the system(adequately decomposed)  \n3.Thorough descriptions of each DFD component  \n## Developing DFDs:Context Diagram\n\nContext Diagram  \n·DFDs follow the same principles of hierarchicdecomposition as IDEF0;highest level diagram is  \ncalled the context diagram  \n·Context diagram includes overall process (i.e.scopeof the system)and sources and sinks that interact withthe overall process,showing:  \no system boundaries  \no external entities that interact with the system (sources/sinks)  \no major information flows between the entities and the system  \n## Developing DFDs:Context Diagram(cont.)\n\nContext Diagram (cont.)  \n·Context diagram consists of only one processsymbol (labeled O),and no data stores are shown  \n·It is decomposed into a first-level diagram(level-0diagram)that shows more details of the processand data flow  \n## Developing DFDs:Context Diagram(cont.)\n\nContext Diagram (cont.)  \n·Boundary relationships of context level aremaintained at each successive level ofdecomposition  \n·Therefore,data flows from sources and to sinks thatappear at the context level also appear at the firstlevel of decomposition (this is called Level-0 DFD)  \n·Decomposition explores greater levels of detail,sodata stores not represented at the context level maybe introduced (e.g.filing cabinet,local to sub-system)  \n·In general,decomposition should be carried out tothe degree necessary for the analyst to understand。the details of the functions and data flows  \n## Developing DFDs:Context Diagram(cont.)","cbCaivIpZWUPmL8k","https://ap.wps.com/l/cbCaivIpZWUPmL8k","pdf",2357399,52,"English","# Lesson Overview\n## Modeling IIS-(p1)\n## Integrated Computer-Aided Manufacturing\n## Definition 0 (IDEFO)-(p1)\n## Data Flow Diagram (DFD)-(p2)\n# DFD-part ii- Diagramming Rules\n## Context Diagram\n## level-0 DFD\n## Data Flow Diagramming Rules\n## Decomposition of DFDs\n## Food Ordering System Summary\n## Balancing DFDs\n## Guidelines for Drawing DFDs\n# Functional/Process Modeling\n## Context Diagram\n## Functional Decomposition\n# Developing DFDs: Context Diagram","[{\"question\":\"What is the purpose of functional decomposition in DFD-based modeling?\",\"answer\":\"Functional decomposition iteratively breaks a system description into finer details, producing hierarchically related charts. It continues until no sub-process can be further logically broken down; the lowest level is a primitive DFD.\"},{\"question\":\"What does a context diagram include in DFD methodology?\",\"answer\":\"A context diagram contains only one process symbol (labeled O) and does not show data stores. It includes the overall process scope plus sources/sinks (external entities) and major information flows between them.\"},{\"question\":\"How is information maintained when decomposing from context level to level-0 and further?\",\"answer\":\"Boundary relationships and the data flows present at the context level are preserved at each successive decomposition level, so flows from sources to sinks also appear in the level-0 DFD. Further decomposition may introduce additional data stores needed for deeper understanding.\"}]","3 - Struct Analys Fnctnal Design-of IIS - p2 - DFD - ii - Diagrams | PDF",1792985205,131]