{"id":8984,"date":"2022-03-01T01:34:52","date_gmt":"2022-03-01T01:34:52","guid":{"rendered":"https:\/\/www.cybermedian.com\/vn\/?p=8984"},"modified":"2025-02-06T17:56:17","modified_gmt":"2025-02-06T09:56:17","slug":"data-flow-diagram-a-comprehensive-tutorial","status":"publish","type":"post","link":"https:\/\/www.cybermedian.com\/vn\/data-flow-diagram-a-comprehensive-tutorial\/","title":{"rendered":"S\u01a1 \u0111\u1ed3 lu\u1ed3ng d\u1eef li\u1ec7u &#8211; M\u1ed9t h\u01b0\u1edbng d\u1eabn to\u00e0n di\u1ec7n"},"content":{"rendered":"<h3>S\u01a1 \u0111\u1ed3 lu\u1ed3ng d\u1eef li\u1ec7u l\u00e0 g\u00ec?<\/h3>\n<p>M\u1ed9t <a href=\"https:\/\/www.visual-paradigm.com\/tutorials\/data-flow-diagram-dfd.jsp\">s\u01a1 \u0111\u1ed3 lu\u1ed3ng d\u1eef li\u1ec7u<\/a>l\u00e0 m\u1ed9t bi\u1ec3u di\u1ec5n \u0111\u1ed3 h\u1ecda v\u1ec1 lu\u1ed3ng d\u1eef li\u1ec7u trong m\u1ed9t h\u1ec7 th\u1ed1ng th\u00f4ng tin. N\u00f3 c\u00f3 th\u1ec3 m\u00f4 t\u1ea3 c\u00e1c lu\u1ed3ng d\u1eef li\u1ec7u v\u00e0o, lu\u1ed3ng d\u1eef li\u1ec7u ra v\u00e0 d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef. DFD kh\u00f4ng \u0111\u1ec1 c\u1eadp \u0111\u1ebfn c\u00e1ch d\u1eef li\u1ec7u ch\u1ea3y qua h\u1ec7 th\u1ed1ng.<\/p>\n<p>K\u1ef9 thu\u1eadt <a href=\"https:\/\/www.visual-paradigm.com\/guide\/data-flow-diagram\/what-is-data-flow-diagram\/\">k\u1ef9 thu\u1eadt DFD<\/a>ph\u00e2n r\u00e3 s\u01a1 \u0111\u1ed3 lu\u1ed3ng d\u1eef li\u1ec7u c\u1ea5p cao th\u00e0nh m\u1ed9t t\u1eadp h\u1ee3p c\u00e1c s\u01a1 \u0111\u1ed3 chi ti\u1ebft h\u01a1n, cung c\u1ea5p c\u00e1i nh\u00ecn t\u1ed5ng th\u1ec3 v\u1ec1 h\u1ec7 th\u1ed1ng ho\u00e0n ch\u1ec9nh, c\u0169ng nh\u01b0 ph\u00e2n r\u00e3 chi ti\u1ebft h\u01a1n. Cung c\u1ea5p c\u00e1i nh\u00ecn t\u1ed5ng th\u1ec3 v\u1ec1 h\u1ec7 th\u1ed1ng ho\u00e0n ch\u1ec9nh, c\u0169ng nh\u01b0 ph\u00e2n r\u00e3 chi ti\u1ebft h\u01a1n v\u00e0, khi th\u00edch h\u1ee3p, m\u1ed9t s\u1ef1 ph\u00e2n t\u00edch v\u00e0 m\u00f4 t\u1ea3 chi ti\u1ebft h\u01a1n v\u1ec1 c\u00e1c ho\u1ea1t \u0111\u1ed9ng ri\u00eang l\u1ebb \u0111\u1ec3 t\u1ea1o \u0111i\u1ec1u ki\u1ec7n cho vi\u1ec7c l\u00e0m r\u00f5 v\u00e0 hi\u1ec3u bi\u1ebft.<\/p>\n<p>K\u1ebft qu\u1ea3 l\u00e0, ph\u1ea1m vi v\u00e0 ranh gi\u1edbi c\u1ee7a h\u1ec7 th\u1ed1ng \u0111\u01b0\u1ee3c ch\u1ec9 r\u00f5 trong s\u01a1 \u0111\u1ed3. K\u1ebft qu\u1ea3 cu\u1ed1i c\u00f9ng c\u1ee7a m\u1ed9t DFD \u0111\u01b0\u1ee3c ph\u00e1t tri\u1ec3n t\u1ed1t l\u00e0 m\u1ed9t \u201cb\u1ee9c tranh l\u1edbn\u201d cho th\u1ea5y nh\u1eefng g\u00ec \u0111ang x\u1ea3y ra \u1edf m\u1ed7i c\u1ea5p \u0111\u1ed9.<\/p>\n<h3>T\u1ea1i sao l\u1ea1i l\u00e0 DFD?<\/h3>\n<p><a href=\"https:\/\/en.wikipedia.org\/wiki\/Data-flow_diagram\">S\u01a1 \u0111\u1ed3 lu\u1ed3ng d\u1eef li\u1ec7u<\/a>cung c\u1ea5p m\u1ed9t bi\u1ec3u di\u1ec5n \u0111\u1ed3 h\u1ecda c\u1ee7a h\u1ec7 th\u1ed1ng nh\u1eb1m m\u1ee5c \u0111\u00edch d\u1ec5 ti\u1ebfp c\u1eadn v\u1edbi<br \/>\nng\u01b0\u1eddi chuy\u00ean m\u00f4n m\u00e1y t\u00ednh v\u00e0 ng\u01b0\u1eddi d\u00f9ng kh\u00f4ng chuy\u00ean c\u0169ng nh\u01b0 nhau.<span style=\"font-size: 1.125rem\">\u0110\u00f3 l\u00e0 m\u1ed9t bi\u1ec3u di\u1ec5n \u0111\u1ed3 h\u1ecda r\u1ea5t d\u1ec5 hi\u1ec3u v\u00ec n\u00f3 gi\u00fap h\u00ecnh dung n\u1ed9i dung.<\/span><\/p>\n<p>C\u00e1c m\u00f4 h\u00ecnh cho ph\u00e9p k\u1ef9 s\u01b0 ph\u1ea7n m\u1ec1m, kh\u00e1ch h\u00e0ng v\u00e0 ng\u01b0\u1eddi d\u00f9ng l\u00e0m vi\u1ec7c c\u00f9ng nhau hi\u1ec7u qu\u1ea3 trong qu\u00e1 tr\u00ecnh ph\u00e2n t\u00edch v\u00e0 x\u00e1c \u0111\u1ecbnh y\u00eau c\u1ea7u.<\/p>\n<p>M\u1eb7c d\u00f9 \u0111i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 kh\u00e1ch h\u00e0ng c\u1ee7a ch\u00fang t\u00f4i c\u1ea7n ph\u1ea3i hi\u1ec3u c\u00e1c k\u1ef9 thu\u1eadt v\u00e0 c\u1ea5u tr\u00fac m\u00f4 h\u00ecnh, nh\u01b0ng trong m\u00f4 h\u00ecnh lu\u1ed3ng d\u1eef li\u1ec7u ch\u1ec9 s\u1eed d\u1ee5ng m\u1ed9t t\u1eadp h\u1ee3p h\u1ea1n ch\u1ebf c\u00e1c c\u1ea5u tr\u00fac, v\u00e0 c\u00e1c quy t\u1eafc \u00e1p d\u1ee5ng \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 \u0111\u01a1n gi\u1ea3n v\u00e0 d\u1ec5 theo d\u00f5i.<\/p>\n<p>D\u01b0\u1edbi \u0111\u00e2y l\u00e0 nh\u1eefng l\u1ee3i \u00edch c\u1ee7a k\u1ef9 thu\u1eadt DFD:<\/p>\n<ul>\n<li><span style=\"font-size: 1.125rem\">\u0110\u00f3 l\u00e0 m\u1ed9t k\u1ef9 thu\u1eadt \u0111\u1ed3 h\u1ecda \u0111\u01a1n gi\u1ea3n d\u1ec5 hi\u1ec3u.<\/span><\/li>\n<li>N\u00f3 c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng \u0111\u01b0\u1ee3c hi\u1ec3u h\u01a1n b\u1edfi c\u1ea3 kh\u00e1n gi\u1ea3 k\u1ef9 thu\u1eadt v\u00e0 kh\u00f4ng k\u1ef9 thu\u1eadt.<\/li>\n<li>N\u00f3 gi\u00fap m\u00f4 t\u1ea3 ranh gi\u1edbi c\u1ee7a h\u1ec7 th\u1ed1ng.<\/li>\n<li>N\u00f3 t\u1ea1o \u0111i\u1ec1u ki\u1ec7n cho vi\u1ec7c truy\u1ec1n \u0111\u1ea1t ki\u1ebfn th\u1ee9c v\u1ec1 h\u1ec7 th\u1ed1ng hi\u1ec7n c\u00f3 \u0111\u1ebfn ng\u01b0\u1eddi d\u00f9ng cu\u1ed1i.<\/li>\n<li>N\u00f3 cung c\u1ea5p m\u1ed9t bi\u1ec3u di\u1ec5n chi ti\u1ebft v\u1ec1 c\u00e1c th\u00e0nh ph\u1ea7n c\u1ee7a h\u1ec7 th\u1ed1ng.<\/li>\n<li>N\u00f3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng nh\u01b0 m\u1ed9t ph\u1ea7n c\u1ee7a t\u00e0i li\u1ec7u h\u1ec7 th\u1ed1ng.<\/li>\n<\/ul>\n<h3>DFD so v\u1edbi S\u01a1 \u0111\u1ed3 lu\u1ed3ng<\/h3>\n<p>C\u00f3 s\u1ef1 kh\u00e1c bi\u1ec7t \u0111\u00e1ng k\u1ec3 gi\u1eefa m\u1ed9t DFD v\u00e0 m\u1ed9t <a href=\"https:\/\/www.visual-paradigm.com\/tutorials\/flowchart-tutorial\/\">s\u01a1 \u0111\u1ed3 lu\u1ed3ng<\/a>. V\u1ec1 c\u01a1 b\u1ea3n, DFD cho th\u1ea5y lu\u1ed3ng d\u1eef li\u1ec7u; s\u01a1 \u0111\u1ed3 lu\u1ed3ng cho th\u1ea5y lu\u1ed3ng \u0111i\u1ec1u khi\u1ec3n.<\/p>\n<ul>\n<li>M\u1ed9t s\u01a1 \u0111\u1ed3 lu\u1ed3ng m\u00f4 t\u1ea3 lu\u1ed3ng \u0111i\u1ec1u khi\u1ec3n trong m\u1ed9t m\u00f4-\u0111un ch\u01b0\u01a1ng tr\u00ecnh v\u00e0 gi\u00fap minh h\u1ecda c\u00e1c b\u01b0\u1edbc \u0111\u1ec3 gi\u1ea3i quy\u1ebft m\u1ed9t v\u1ea5n \u0111\u1ec1.<\/li>\n<li>M\u1ed9t DFD minh h\u1ecda c\u00e1c \u0111\u1ea7u v\u00e0o, \u0111\u1ea7u ra, c\u00e1ch d\u1eef li\u1ec7u s\u1ebd ch\u1ea3y qua h\u1ec7 th\u1ed1ng v\u00e0 n\u01a1i d\u1eef li\u1ec7u s\u1ebd \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef. N\u00f3 kh\u00f4ng ch\u1ee9a b\u1ea5t k\u1ef3 y\u1ebfu t\u1ed1 \u0111i\u1ec1u khi\u1ec3n ho\u1eb7c ph\u00e2n nh\u00e1nh n\u00e0o.<\/li>\n<\/ul>\n<h3>C\u00e1c y\u1ebfu t\u1ed1 c\u1ee7a DFD<\/h3>\n<ul>\n<li><strong>Th\u1ef1c th\u1ec3<\/strong> \u2013 Th\u1ef1c th\u1ec3 l\u00e0 ngu\u1ed3n v\u00e0 \u0111\u00edch c\u1ee7a d\u1eef li\u1ec7u th\u00f4ng tin. Th\u1ef1c th\u1ec3 \u0111\u01b0\u1ee3c \u0111\u1ea1i di\u1ec7n b\u1edfi<br \/>\nnh\u1eefng h\u00ecnh ch\u1eef nh\u1eadt v\u00e0 c\u00f3 t\u00ean ri\u00eang c\u1ee7a ch\u00fang.<\/li>\n<\/ul>\n<p><img alt=\"notation (external entity)\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/01___notation_external_entity.png\"\/><\/p>\n<ul>\n<li><strong>Quy tr\u00ecnh<\/strong> \u2013 C\u00e1c ho\u1ea1t \u0111\u1ed9ng v\u00e0 h\u00e0nh \u0111\u1ed9ng th\u1ef1c hi\u1ec7n tr\u00ean d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c \u0111\u1ea1i di\u1ec7n b\u1edfi c\u00e1c h\u00ecnh tr\u00f2n ho\u1eb7c h\u00ecnh ch\u1eef nh\u1eadt tr\u00f2n.<\/li>\n<\/ul>\n<p><img alt=\"notation (process)\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/02___notation_process.png\"\/><\/p>\n<ul>\n<li><strong>L\u01b0u tr\u1eef d\u1eef li\u1ec7u<\/strong> \u2013 C\u00f3 hai bi\u1ebfn th\u1ec3 c\u1ee7a l\u01b0u tr\u1eef d\u1eef li\u1ec7u \u2013 n\u00f3 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u0111\u1ea1i di\u1ec7n nh\u01b0 \u2013 1. N\u00f3 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u0111\u1ea1i di\u1ec7n nh\u01b0 m\u1ed9t h\u00ecnh ch\u1eef nh\u1eadt kh\u00f4ng c\u00f3 hai c\u1ea1nh nh\u1ecf, 2) ho\u1eb7c nh\u01b0 m\u1ed9t h\u00ecnh ch\u1eef nh\u1eadt m\u1edf ch\u1ec9 c\u00f3 m\u1ed9t c\u1ea1nh<br \/>\nM\u1ed9t h\u00ecnh ch\u1eef nh\u1eadt m\u1edf v\u1edbi c\u00e1c c\u1ea1nh b\u1ecb thi\u1ebfu.<\/li>\n<\/ul>\n<p><img alt=\"notation (data store)\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/03___notation_data_store.png\"\/><\/p>\n<ul>\n<li><strong>Lu\u1ed3ng d\u1eef li\u1ec7u<\/strong> \u2013 s\u1ef1 di chuy\u1ec3n c\u1ee7a d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c \u0111\u1ea1i di\u1ec7n b\u1edfi c\u00e1c m\u0169i t\u00ean s\u1eafc n\u00e9t. S\u1ef1 di chuy\u1ec3n c\u1ee7a d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c th\u1ec3 hi\u1ec7n nh\u01b0 \u0111i t\u1eeb \u0111\u00e1y c\u1ee7a m\u0169i t\u00ean nh\u01b0 ngu\u1ed3n c\u1ee7a n\u00f3 \u0111\u1ebfn \u0111\u1ea7u c\u1ee7a m\u0169i t\u00ean nh\u01b0 \u0111\u00edch c\u1ee7a n\u00f3.<\/li>\n<\/ul>\n<p><img alt=\"notation (data flow)\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/04___notation_data_flow.png\"\/><\/p>\n<h3>V\u00ed d\u1ee5 v\u1ec1 Lu\u1ed3ng D\u1eef li\u1ec7u \u2013 Ng\u00e2n h\u00e0ng \u0111i\u1ec7n t\u1eed<\/h3>\n<p>M\u1ed9t gi\u00e1m \u0111\u1ed1c ng\u00e2n h\u00e0ng cung c\u1ea5p th\u00f4ng tin t\u00e0i kho\u1ea3n m\u1edbi cho quy tr\u00ecnh T\u00e0i kho\u1ea3n m\u1edf, d\u1eabn \u0111\u1ebfn th\u00f4ng tin kh\u00e1ch h\u00e0ng \u0111\u01b0\u1ee3c l\u01b0u gi\u1eef trong kho d\u1eef li\u1ec7u c\u01a1 s\u1edf d\u1eef li\u1ec7u Kh\u00e1ch h\u00e0ng v\u00e0 th\u00f4ng tin t\u00e0i kho\u1ea3n \u0111\u01b0\u1ee3c l\u01b0u gi\u1eef trong kho d\u1eef li\u1ec7u c\u01a1 s\u1edf d\u1eef li\u1ec7u T\u00e0i kho\u1ea3n. M\u1eb7c d\u00f9 ch\u00fang t\u00f4i s\u1eed d\u1ee5ng t\u1eeb \u201ck\u1ebft qu\u1ea3\u201d trong c\u00e1ch di\u1ec5n gi\u1ea3i c\u1ee7a m\u00ecnh, DFD kh\u00f4ng ng\u1ee5 \u00fd nguy\u00ean nh\u00e2n; T\u1ea5t c\u1ea3 nh\u1eefng g\u00ec n\u00f3 cho th\u1ea5y l\u00e0 quy tr\u00ecnh m\u1edf t\u00e0i kho\u1ea3n c\u00f3 th\u1ec3 \u0111\u1ecdc d\u1eef li\u1ec7u t\u1eeb giao di\u1ec7n c\u1ee7a gi\u00e1m \u0111\u1ed1c ng\u00e2n h\u00e0ng m\u00e0 kh\u00f4ng ghi d\u1eef li\u1ec7u v\u00e0o kho d\u1eef li\u1ec7u c\u01a1 s\u1edf d\u1eef li\u1ec7u kh\u00e1ch h\u00e0ng v\u00e0 c\u01a1 s\u1edf d\u1eef li\u1ec7u t\u00e0i kho\u1ea3n theo m\u1ed9t th\u1ee9 t\u1ef1 c\u1ee5 th\u1ec3.<\/p>\n<p>M\u1ed9t kh\u00e1ch h\u00e0ng s\u1eed d\u1ee5ng quy tr\u00ecnh \u0111\u0103ng nh\u1eadp ng\u00e2n h\u00e0ng tr\u1ef1c tuy\u1ebfn ph\u1ea3i cung c\u1ea5p m\u1ed9t s\u1ed1 d\u1eef li\u1ec7u, ch\u1eb3ng h\u1ea1n nh\u01b0 t\u00ean ng\u01b0\u1eddi d\u00f9ng v\u00e0 m\u1eadt kh\u1ea9u, d\u01b0\u1edbi d\u1ea1ng m\u1ed9t t\u1eadp h\u1ee3p th\u00f4ng tin \u0111\u0103ng nh\u1eadp.<\/p>\n<p>M\u1ed9t kh\u00e1ch h\u00e0ng c\u00f3 th\u1ec3 nh\u1eadn m\u1ed9t kho\u1ea3n ti\u1ec1n t\u1eeb vi\u1ec7c r\u00fat ti\u1ec1n ho\u1eb7c \u0111\u00f3ng g\u00f3p m\u1ed9t kho\u1ea3n ti\u1ec1n v\u00e0o m\u1ed9t kho\u1ea3n ti\u1ec1n g\u1eedi; Trong c\u1ea3 hai tr\u01b0\u1eddng h\u1ee3p, \u0111i\u1ec1u n\u00e0y d\u1eabn \u0111\u1ebfn vi\u1ec7c c\u1eadp nh\u1eadt s\u1ed1 d\u01b0 t\u00e0i kho\u1ea3n trong kho d\u1eef li\u1ec7u c\u01a1 s\u1edf d\u1eef li\u1ec7u t\u00e0i kho\u1ea3n (m\u1eb7c d\u00f9 nguy\u00ean nh\u00e2n n\u00e0y kh\u00f4ng th\u1ec3 \u0111\u01b0\u1ee3c m\u00f4 h\u00ecnh h\u00f3a m\u1ed9t c\u00e1ch r\u00f5 r\u00e0ng).<\/p>\n<p>M\u1ed9t kh\u00e1ch h\u00e0ng c\u00f3 th\u1ec3 kh\u1edfi \u0111\u1ed9ng quy tr\u00ecnh chuy\u1ec3n ti\u1ec1n v\u00e0 ph\u1ea3i cung c\u1ea5p \u0111\u00edch t\u00e0i kho\u1ea3n v\u00e0 s\u1ed1 ti\u1ec1n. Quy tr\u00ecnh chuy\u1ec3n ti\u1ec1n c\u00f3 th\u1ec3 g\u1eedi s\u1ed1 ti\u1ec1n \u0111\u1ebfn m\u1ed9t ng\u00e2n h\u00e0ng kh\u00e1c th\u00f4ng qua giao di\u1ec7n ng\u00e2n h\u00e0ng kh\u00e1c.<img decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/03\/bank-account-data-flow-diagram.png\"\/><\/p>\n<p style=\"text-align: center\"><a class=\"edit-template-v1\" href=\"https:\/\/online.visual-paradigm.com\/app\/diagrams\/#diagram:proj=0&amp;type=DataFlowDiagram&amp;gallery=\/repository\/13fcf5a3-39b6-438b-9cfa-3741dc750a2d.xml&amp;name=Bank%20Account%20Data%20Flow%20Diagram\">Ch\u1ec9nh s\u1eeda v\u00ed d\u1ee5 v\u1ec1 S\u01a1 \u0111\u1ed3 Lu\u1ed3ng D\u1eef li\u1ec7u n\u00e0y<\/a><\/p>\n<p id=\"NvzzDpk\">V\u00ed d\u1ee5 DFD n\u00e0y \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb \u1edf tr\u00ean bao g\u1ed3m n\u0103m quy tr\u00ecnh, b\u1ed1n giao di\u1ec7n\/ vai tr\u00f2 b\u00ean ngo\u00e0i v\u00e0 hai kho d\u1eef li\u1ec7u. N\u00f3 kh\u00f4ng c\u00f3 ngh\u0129a l\u00e0 m\u1ed9t bi\u1ec3u di\u1ec5n \u0111\u1ea7y \u0111\u1ee7 v\u1ec1 c\u00e1c lu\u1ed3ng d\u1eef li\u1ec7u trong m\u1ed9t h\u1ec7 th\u1ed1ng ng\u00e2n h\u00e0ng, nh\u01b0ng n\u00f3 \u0111\u1ee7 to\u00e0n di\u1ec7n \u0111\u1ec3 cung c\u1ea5p c\u1ea3m gi\u00e1c v\u1ec1 c\u00e1ch x\u00e2y d\u1ef1ng m\u1ed9t DFD.<\/p>\n<h3>K\u1ef9 thu\u1eadt Ph\u00e2n r\u00e3 T\u1eeb tr\u00ean xu\u1ed1ng \u2013 DFD nhi\u1ec1u c\u1ea5p<\/h3>\n<p>M\u1ed9t l\u1ee3i th\u1ebf l\u1edbn c\u1ee7a k\u1ef9 thu\u1eadt m\u00f4 h\u00ecnh h\u00f3a lu\u1ed3ng d\u1eef li\u1ec7u l\u00e0 th\u00f4ng qua m\u1ed9t k\u1ef9 thu\u1eadt g\u1ecdi l\u00e0 ph\u00e2n r\u00e3 t\u1eeb tr\u00ean xu\u1ed1ng (c\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 \u201cc\u1ea5p \u0111\u1ed9\u201d), \u0111\u1ed9 ph\u1ee9c t\u1ea1p chi ti\u1ebft c\u1ee7a c\u00e1c h\u1ec7 th\u1ed1ng th\u1ebf gi\u1edbi th\u1ef1c c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c qu\u1ea3n l\u00fd v\u00e0 m\u00f4 h\u00ecnh h\u00f3a trong m\u1ed9t h\u1ec7 th\u1ed1ng ph\u00e2n c\u1ea5p c\u00e1c tr\u1eebu t\u01b0\u1ee3ng. C\u1ea5p \u0111\u1ed9 \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n b\u1eb1ng c\u00e1ch v\u1ebd m\u1ed9t lo\u1ea1t c\u00e1c DFD ng\u00e0y c\u00e0ng chi ti\u1ebft cho \u0111\u1ebfn khi \u0111\u1ea1t \u0111\u01b0\u1ee3c m\u1ee9c \u0111\u1ed9 chi ti\u1ebft mong mu\u1ed1n.<\/p>\n<p>\u0110\u1ec3 l\u00e0m cho DFD th\u1eadm ch\u00ed ph\u1ee9c t\u1ea1p h\u01a1n (t\u1ee9c l\u00e0, kh\u00f4ng qu\u00e1 nhi\u1ec1u quy tr\u00ecnh), b\u1ea1n c\u00f3 th\u1ec3 t\u1ea1o ra c\u00e1c DFD nhi\u1ec1u c\u1ea5p.<\/p>\n<ul>\n<li>S\u01a1 \u0111\u1ed3 ng\u1eef c\u1ea3nh ch\u1ee9a quy tr\u00ecnh h\u1ec7 th\u1ed1ng \u0111i\u1ec1u khi\u1ec3n (t\u1ed5ng h\u1ee3p).<\/li>\n<li><span style=\"font-size: 1.125rem\">DFD c\u1ea5p cao h\u01a1n \u00edt chi ti\u1ebft h\u01a1n (DFD chi ti\u1ebft h\u01a1n \u0111\u01b0\u1ee3c ph\u00e1t tri\u1ec3n \u1edf c\u1ea5p th\u1ea5p h\u01a1n) \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 quy tr\u00ecnh ph\u00e2n r\u00e3 t\u1eeb tr\u00ean xu\u1ed1ng.<\/span><\/li>\n<li>S\u01a1 \u0111\u1ed3 ng\u1eef c\u1ea3nh b\u1eaft \u0111\u1ea7u v\u1edbi c\u00e1c s\u1ed1 quy tr\u00ecnh (v\u00ed d\u1ee5: quy tr\u00ecnh 1, quy tr\u00ecnh 2, v\u00e0 c\u1ee9 th\u1ebf).<\/li>\n<li>Vi\u1ec7c \u0111\u00e1nh s\u1ed1 ti\u1ebfp t\u1ee5c \u1edf c\u1ea5p \u0111\u1ea7u ti\u00ean \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 (DFD). V\u00ed d\u1ee5, quy tr\u00ecnh 1 trong s\u01a1 \u0111\u1ed3 ng\u1eef c\u1ea3nh \u0111\u01b0\u1ee3c tinh ch\u1ec9nh th\u00e0nh ba quy tr\u00ecnh trong DFD c\u1ea5p m\u1ed9t v\u00e0 \u0111\u01b0\u1ee3c \u0111\u00e1nh s\u1ed1 1.1, 1.2 v\u00e0 1.3.<\/li>\n<li>T\u01b0\u01a1ng t\u1ef1, c\u00e1c quy tr\u00ecnh trong l\u1edbp th\u1ee9 hai \u0111\u01b0\u1ee3c \u0111\u00e1nh s\u1ed1, v\u00ed d\u1ee5: 2.1.1, 2.1.2, 2.1.3 v\u00e0 2.1.4. Vi\u1ec7c \u0111\u00e1nh s\u1ed1 cho quy tr\u00ecnh trong ph\u00e2n c\u1ea5p:\n<ul>\n<li>(1, 2, 3,\u2026);<\/li>\n<li>(1.1, 1.2, 1.3, \u2026, 2.1, 2.2, 2.3,\u2026);<\/li>\n<li>(1.1.1, 1.1.2, 1.1.3,\u2026).<\/li>\n<\/ul>\n<\/li>\n<li>S\u1ed1 l\u01b0\u1ee3ng l\u1edbp ph\u1ee5 thu\u1ed9c v\u00e0o k\u00edch th\u01b0\u1edbc c\u1ee7a h\u1ec7 th\u1ed1ng m\u00f4 h\u00ecnh.<\/li>\n<\/ul>\n<p>Khi th\u1ef1c hi\u1ec7n ph\u00e2n r\u00e3 t\u1eeb tr\u00ean xu\u1ed1ng m\u1ed9t DFD \u0111\u1ebfn c\u00e1c DFD c\u1ea5p th\u1ea5p h\u01a1n, c\u00e1c \u0111\u1ea7u v\u00e0o v\u00e0 \u0111\u1ea7u ra ph\u1ea3i \u0111\u01b0\u1ee3c b\u1ea3o t\u1ed3n gi\u1eefa c\u00e1c c\u1ea5p \u0111\u1ed9 c\u1ee7a DFD. V\u00ed d\u1ee5, c\u1ea5p n &amp; n+1 ph\u1ea3i c\u00f3 c\u00f9ng \u0111\u1ea7u v\u00e0o v\u00e0 \u0111\u1ea7u ra<\/p>\n<p><img alt=\"Balancing DFD\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/17-balancing-dfd.png\"\/><\/p>\n<h3><a href=\"https:\/\/www.visual-paradigm.com\/tw\/tutorials\/data-flow-diagram-example-food-ordering-system.jsp\">V\u00ed d\u1ee5 DFD<\/a> \u2013 h\u1ec7 th\u1ed1ng \u0111\u1eb7t m\u00f3n \u0103n<\/h3>\n<h4>S\u01a1 \u0111\u1ed3 ng\u1eef c\u1ea3nh (C\u1ea5p 0 \u2013 DFD)<\/h4>\n<p>M\u1ed9t s\u01a1 \u0111\u1ed3 ng\u1eef c\u1ea3nh cho th\u1ea5y c\u00e1i nh\u00ecn t\u1ed5ng quan v\u1ec1 h\u1ec7 th\u1ed1ng v\u00e0 c\u00e1ch n\u00f3 t\u01b0\u01a1ng t\u00e1c v\u1edbi c\u00e1c ph\u1ea7n kh\u00e1c c\u1ee7a \u201cth\u1ebf gi\u1edbi\u201d. M\u1ed9t s\u01a1 \u0111\u1ed3 ng\u1eef c\u1ea3nh l\u00e0 m\u1ed9t s\u01a1 \u0111\u1ed3 lu\u1ed3ng d\u1eef li\u1ec7u ch\u1ec9 cho th\u1ea5y c\u1ea5p \u0111\u1ed9 cao nh\u1ea5t, \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 c\u1ea5p 0. \u1ede c\u1ea5p \u0111\u1ed9 n\u00e0y, ch\u1ec9 c\u00f3 m\u1ed9t n\u00fat quy tr\u00ecnh hi\u1ec3n th\u1ecb ch\u1ee9c n\u0103ng c\u1ee7a m\u1ed9t h\u1ec7 th\u1ed1ng ho\u00e0n ch\u1ec9nh, t\u1ee9c l\u00e0 c\u00e1ch n\u00f3 t\u01b0\u01a1ng t\u00e1c v\u1edbi c\u00e1c th\u1ef1c th\u1ec3 b\u00ean ngo\u00e0i. M\u1ed9t s\u1ed1 l\u1ee3i \u00edch c\u1ee7a s\u01a1 \u0111\u1ed3 ng\u1eef c\u1ea3nh l\u00e0.<\/p>\n<ul>\n<li>Hi\u1ec3n th\u1ecb c\u00e1i nh\u00ecn t\u1ed5ng quan v\u1ec1 ranh gi\u1edbi c\u1ee7a m\u1ed9t h\u1ec7 th\u1ed1ng<\/li>\n<li>B\u1eb1ng k\u00fd hi\u1ec7u \u0111\u01a1n gi\u1ea3n c\u1ee7a n\u00f3, n\u00f3 kh\u00f4ng y\u00eau c\u1ea7u ki\u1ebfn th\u1ee9c k\u1ef9 thu\u1eadt \u0111\u1ec3 hi\u1ec3u<\/li>\n<li>D\u1ec5 d\u00e0ng v\u1ebd, s\u1eeda \u0111\u1ed5i v\u00e0 ph\u00e1t tri\u1ec3n do k\u00fd hi\u1ec7u h\u1ea1n ch\u1ebf c\u1ee7a n\u00f3<\/li>\n<\/ul>\n<p>H\u00ecnh d\u01b0\u1edbi \u0111\u00e2y cho th\u1ea5y m\u1ed9t s\u01a1 \u0111\u1ed3 ng\u1eef c\u1ea3nh (s\u01a1 \u0111\u1ed3 lu\u1ed3ng d\u1eef li\u1ec7u c\u1ea5p cao) \u0111\u01b0\u1ee3c v\u1ebd cho m\u1ed9t h\u1ec7 th\u1ed1ng \u0111\u1eb7t m\u00f3n \u0103n.<\/p>\n<ul>\n<li>N\u00f3 ch\u1ee9a m\u1ed9t quy tr\u00ecnh (h\u00ecnh d\u1ea1ng) \u0111\u1ea1i di\u1ec7n cho m\u00f4 h\u00ecnh h\u1ec7 th\u1ed1ng, trong tr\u01b0\u1eddng h\u1ee3p n\u00e0y l\u00e0 \u201ch\u1ec7 th\u1ed1ng \u0111\u1eb7t m\u00f3n \u0103n\u201d.<\/li>\n<li>N\u00f3 c\u0169ng cho th\u1ea5y c\u00e1c b\u00ean tham gia s\u1ebd t\u01b0\u01a1ng t\u00e1c v\u1edbi h\u1ec7 th\u1ed1ng, \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 c\u00e1c th\u1ef1c th\u1ec3 b\u00ean ngo\u00e0i.<\/li>\n<\/ul>\n<p>Trong v\u00ed d\u1ee5 n\u00e0y, nh\u00e0 cung c\u1ea5p, nh\u00e0 b\u1ebfp, qu\u1ea3n l\u00fd v\u00e0 kh\u00e1ch h\u00e0ng l\u00e0 c\u00e1c th\u1ef1c th\u1ec3 s\u1ebd t\u01b0\u01a1ng t\u00e1c v\u1edbi h\u1ec7 th\u1ed1ng.<\/p>\n<p>Gi\u1eefa quy tr\u00ecnh v\u00e0 c\u00e1c th\u1ef1c th\u1ec3 b\u00ean ngo\u00e0i, c\u00f3 c\u00e1c lu\u1ed3ng d\u1eef li\u1ec7u (k\u1ebft n\u1ed1i) cho th\u1ea5y c\u00f3 s\u1ef1 trao \u0111\u1ed5i th\u00f4ng tin gi\u1eefa c\u00e1c th\u1ef1c th\u1ec3 v\u00e0 h\u1ec7 th\u1ed1ng.<\/p>\n<p><img class=\"aligncenter\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/food-ordering-system-context-dfd.png\"\/><\/p>\n<p style=\"text-align: center\"><a class=\"edit-template-v1\" href=\"https:\/\/online.visual-paradigm.com\/app\/diagrams\/#diagram:proj=0&amp;type=DataFlowDiagram&amp;gallery=\/repository\/0a02926d-965e-4443-8103-980b71d7c91f.xml&amp;name=Food%20Ordering%20System%20Context%20DFD\">Ch\u1ec9nh s\u1eeda v\u00ed d\u1ee5 DFD n\u00e0y<\/a><\/p>\n<p>DFD ng\u1eef c\u1ea3nh l\u00e0 \u0111i\u1ec3m v\u00e0o c\u1ee7a m\u00f4 h\u00ecnh lu\u1ed3ng d\u1eef li\u1ec7u. N\u00f3 ch\u1ee9a m\u1ed9t v\u00e0 ch\u1ec9 m\u1ed9t quy tr\u00ecnh v\u00e0 kh\u00f4ng hi\u1ec3n th\u1ecb b\u1ea5t k\u1ef3 l\u01b0u tr\u1eef d\u1eef li\u1ec7u n\u00e0o.<\/p>\n<h3>DFD C\u1ea5p 1<\/h3>\n<p>DFD C\u1ea5p 1 tr\u00ecnh b\u00e0y m\u1ed9t c\u00e1i nh\u00ecn chi ti\u1ebft h\u01a1n v\u1ec1 h\u1ec7 th\u1ed1ng so v\u1edbi s\u01a1 \u0111\u1ed3 ng\u1eef c\u1ea3nh. B\u1eb1ng c\u00e1ch hi\u1ec3n th\u1ecb c\u00e1c quy tr\u00ecnh con ch\u00ednh v\u00e0 c\u00e1c kho d\u1eef li\u1ec7u t\u1ea1o th\u00e0nh h\u1ec7 th\u1ed1ng.<\/p>\n<p>S\u01a1 \u0111\u1ed3 d\u01b0\u1edbi \u0111\u00e2y cho th\u1ea5y DFD C\u1ea5p 1, l\u00e0 m\u1ed9t s\u1ef1 ph\u00e2n r\u00e3 (t\u1ee9c l\u00e0 ph\u00e2n r\u00e3) c\u1ee7a c\u00e1c quy tr\u00ecnh h\u1ec7 th\u1ed1ng \u0111\u1eb7t m\u00f3n \u0103n \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb trong DFD ng\u1eef c\u1ea3nh. \u0110\u1ecdc qua s\u01a1 \u0111\u1ed3, v\u00e0 sau \u0111\u00f3 ch\u00fang t\u00f4i s\u1ebd gi\u1edbi thi\u1ec7u m\u1ed9t s\u1ed1 kh\u00e1i ni\u1ec7m ch\u00ednh d\u1ef1a tr\u00ean n\u00f3.<\/p>\n<p><img class=\"aligncenter\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/food-ordering-system.png\"\/><\/p>\n<p style=\"text-align: center\"><a class=\"edit-template-v1\" href=\"https:\/\/online.visual-paradigm.com\/app\/diagrams\/#diagram:proj=0&amp;type=DataFlowDiagram&amp;gallery=\/repository\/2e409d26-3345-4516-acde-c36b59fa3e0b.xml&amp;name=Food%20Ordering%20System\" id=\"tinymce\">Ch\u1ec9nh s\u1eeda v\u00ed d\u1ee5 v\u1ec1 S\u01a1 \u0111\u1ed3 Lu\u1ed3ng D\u1eef li\u1ec7u n\u00e0y<\/a><\/p>\n<p>M\u1ed9t v\u00ed d\u1ee5 v\u1ec1 s\u01a1 \u0111\u1ed3 lu\u1ed3ng d\u1eef li\u1ec7u c\u1ee7a h\u1ec7 th\u1ed1ng \u0111\u1eb7t m\u00f3n \u0103n ch\u1ee9a ba quy tr\u00ecnh, b\u1ed1n th\u1ef1c th\u1ec3 b\u00ean ngo\u00e0i v\u00e0 hai kho d\u1eef li\u1ec7u.<\/p>\n<ol>\n<li>Theo s\u01a1 \u0111\u1ed3, ch\u00fang t\u00f4i bi\u1ebft r\u1eb1ng m\u1ed9t kh\u00e1ch h\u00e0ng c\u00f3 th\u1ec3 \u0111\u1eb7t h\u00e0ng. Quy tr\u00ecnh \u0111\u1eb7t m\u00f3n \u0103n nh\u1eadn \u0111\u01a1n h\u00e0ng, chuy\u1ec3n ti\u1ebfp n\u00f3 \u0111\u1ebfn nh\u00e0 b\u1ebfp, l\u01b0u tr\u1eef n\u00f3 trong kho d\u1eef li\u1ec7u \u0111\u01a1n h\u00e0ng v\u00e0 l\u01b0u tr\u1eef c\u00e1c chi ti\u1ebft h\u00e0ng t\u1ed3n kho \u0111\u00e3 c\u1eadp nh\u1eadt trong kho d\u1eef li\u1ec7u h\u00e0ng t\u1ed3n kho. Quy tr\u00ecnh c\u0169ng cung c\u1ea5p h\u00f3a \u0111\u01a1n cho kh\u00e1ch h\u00e0ng.<\/li>\n<li>C\u00e1c qu\u1ea3n l\u00fd c\u00f3 th\u1ec3 nh\u1eadn b\u00e1o c\u00e1o th\u00f4ng qua quy tr\u00ecnh T\u1ea1o b\u00e1o c\u00e1o, quy tr\u00ecnh n\u00e0y l\u1ea5y chi ti\u1ebft h\u00e0ng t\u1ed3n kho v\u00e0 \u0111\u01a1n h\u00e0ng l\u00e0m \u0111\u1ea7u v\u00e0o cho kho d\u1eef li\u1ec7u h\u00e0ng t\u1ed3n kho v\u00e0 kho d\u1eef li\u1ec7u \u0111\u01a1n h\u00e0ng, t\u01b0\u01a1ng \u1ee9ng.<\/li>\n<li>Ng\u01b0\u1eddi qu\u1ea3n l\u00fd c\u0169ng c\u00f3 th\u1ec3 kh\u1edfi \u0111\u1ed9ng quy tr\u00ecnh \u0110\u1eb7t h\u00e0ng t\u1ed3n kho b\u1eb1ng c\u00e1ch cung c\u1ea5p m\u1ed9t \u0111\u01a1n \u0111\u1eb7t h\u00e0ng h\u00e0ng t\u1ed3n kho. Quy tr\u00ecnh n\u00e0y chuy\u1ec3n ti\u1ebfp \u0111\u01a1n \u0111\u1eb7t h\u00e0ng h\u00e0ng t\u1ed3n kho \u0111\u1ebfn nh\u00e0 cung c\u1ea5p v\u00e0 l\u01b0u tr\u1eef c\u00e1c chi ti\u1ebft h\u00e0ng t\u1ed3n kho \u0111\u00e3 c\u1eadp nh\u1eadt trong kho d\u1eef li\u1ec7u h\u00e0ng t\u1ed3n kho.<\/li>\n<\/ol>\n<h3><a href=\"https:\/\/www.visual-paradigm.com\/guide\/data-flow-diagram\/logical-vs-physical-data-flow-diagrams\/\">DFD Logic so v\u1edbi DFD V\u1eadt l\u00fd<\/a><\/h3>\n<p>C\u00e1c s\u01a1 \u0111\u1ed3 lu\u1ed3ng d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c chia th\u00e0nh s\u01a1 \u0111\u1ed3 lu\u1ed3ng d\u1eef li\u1ec7u logic v\u00e0 s\u01a1 \u0111\u1ed3 lu\u1ed3ng d\u1eef li\u1ec7u v\u1eadt l\u00fd. DFD logic t\u1eadp trung v\u00e0o doanh nghi\u1ec7p v\u00e0 c\u00e1ch n\u00f3 ho\u1ea1t \u0111\u1ed9ng. N\u00f3 m\u00f4 t\u1ea3 c\u00e1c s\u1ef1 ki\u1ec7n kinh doanh x\u1ea3y ra v\u00e0 d\u1eef li\u1ec7u c\u1ea7n thi\u1ebft v\u00e0 \u0111\u01b0\u1ee3c t\u1ea1o ra cho m\u1ed7i s\u1ef1 ki\u1ec7n. DFD v\u1eadt l\u00fd, m\u1eb7t kh\u00e1c, cho th\u1ea5y c\u00e1ch h\u1ec7 th\u1ed1ng s\u1ebd \u0111\u01b0\u1ee3c tri\u1ec3n khai. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 nh\u1eefng kh\u00e1c bi\u1ec7t ch\u00ednh gi\u1eefa DFD logic v\u00e0 DFD v\u1eadt l\u00fd:<\/p>\n<h3>DFD Logic<\/h3>\n<ul>\n<li>DFD logic m\u00f4 t\u1ea3 c\u00e1ch doanh nghi\u1ec7p ho\u1ea1t \u0111\u1ed9ng.<\/li>\n<li>C\u00e1c quy tr\u00ecnh \u0111\u1ea1i di\u1ec7n cho c\u00e1c ho\u1ea1t \u0111\u1ed9ng kinh doanh.<\/li>\n<li>C\u00e1c kho d\u1eef li\u1ec7u \u0111\u1ea1i di\u1ec7n cho t\u1eadp h\u1ee3p d\u1eef li\u1ec7u b\u1ea5t k\u1ec3 c\u00e1ch d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef.<\/li>\n<li>\u0110\u00f3 l\u00e0 c\u00e1ch doanh nghi\u1ec7p ki\u1ec3m so\u00e1t.<\/li>\n<\/ul>\n<h3>DFD V\u1eadt l\u00fd<\/h3>\n<ul>\n<li style=\"list-style-type: none\">\n<ul>\n<li>DFD v\u1eadt l\u00fd m\u00f4 t\u1ea3 c\u00e1ch h\u1ec7 th\u1ed1ng s\u1ebd \u0111\u01b0\u1ee3c tri\u1ec3n khai (ho\u1eb7c c\u00e1ch h\u1ec7 th\u1ed1ng hi\u1ec7n t\u1ea1i ho\u1ea1t \u0111\u1ed9ng).<\/li>\n<li>C\u00e1c quy tr\u00ecnh \u0111\u1ea1i di\u1ec7n cho c\u00e1c ch\u01b0\u01a1ng tr\u00ecnh, m\u00f4-\u0111un ch\u01b0\u01a1ng tr\u00ecnh v\u00e0 quy tr\u00ecnh th\u1ee7 c\u00f4ng.<\/li>\n<li>C\u00e1c kho d\u1eef li\u1ec7u \u0111\u1ea1i di\u1ec7n cho c\u00e1c t\u1ec7p v\u1eadt l\u00fd v\u00e0 c\u01a1 s\u1edf d\u1eef li\u1ec7u, t\u1ec7p th\u1ee7 c\u00f4ng.<\/li>\n<li>N\u00f3 cho th\u1ea5y c\u00e1c ki\u1ec3m so\u00e1t \u0111\u1ec3 x\u00e1c th\u1ef1c d\u1eef li\u1ec7u \u0111\u1ea7u v\u00e0o, \u0111\u1ec3 l\u1ea5y m\u1ed9t b\u1ea3n ghi, \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o ho\u00e0n th\u00e0nh th\u00e0nh c\u00f4ng m\u1ed9t quy tr\u00ecnh v\u00e0 \u0111\u1ec3 b\u1ea3o m\u1eadt h\u1ec7 th\u1ed1ng.<\/li>\n<\/ul>\n<\/li>\n<li>DFD v\u1eadt l\u00fd x\u00e1c \u0111\u1ecbnh lu\u1ed3ng th\u1ef1c t\u1ebf c\u1ee7a t\u00e0i li\u1ec7u v\u1eadt l\u00fd, trong khi DFD logic ch\u1ec9 t\u1eadp trung v\u00e0o lu\u1ed3ng th\u00f4ng tin theo thu\u1eadt ng\u1eef kinh doanh.<\/li>\n<\/ul>\n<p>V\u00ed d\u1ee5, DFD v\u1eadt l\u00fd x\u00e1c \u0111\u1ecbnh lu\u1ed3ng th\u1ef1c t\u1ebf c\u1ee7a t\u00e0i li\u1ec7u v\u1eadt l\u00fd, trong khi DFD logic ch\u1ec9 t\u1eadp trung v\u00e0o lu\u1ed3ng th\u00f4ng tin theo thu\u1eadt ng\u1eef kinh doanh.<\/p>\n<p><img alt=\"Physical and Logical DFD: Example 1\" class=\"aligncenter\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/01-dfd-example-physical-dfd-to-logical-dfd.png\"\/><\/p>\n<p>H\u01a1n n\u1eefa, m\u1ed9t DFD logic lo\u1ea1i b\u1ecf c\u00e1c quy tr\u00ecnh v\u1eadt l\u00fd ch\u1ec9 \u0111\u1ec1 c\u1eadp \u0111\u1ebfn c\u00e1c ho\u1ea1t \u0111\u1ed9ng v\u1eadt l\u00fd v\u00e0 kh\u00f4ng bi\u1ebfn \u0111\u1ed5i d\u1eef li\u1ec7u.<\/p>\n<p><img alt=\"Physical and Logical DFD: Example 2\" class=\"aligncenter\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/02-dfd-example-physical-to-logical-dfd.png\"\/><\/p>\n<h3>V\u00ed d\u1ee5 DFD Logic \u2013 C\u1eeda h\u00e0ng t\u1ea1p h\u00f3a<\/h3>\n<p>DFD logic minh h\u1ecda c\u00e1c quy tr\u00ecnh li\u00ean quan m\u00e0 kh\u00f4ng \u0111i v\u00e0o chi ti\u1ebft v\u1ec1 vi\u1ec7c tri\u1ec3n khai v\u1eadt l\u00fd c\u1ee7a c\u00e1c ho\u1ea1t \u0111\u1ed9ng.<\/p>\n<p><img alt=\"Logical DFD Example - Grocery Store\" class=\"aligncenter\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/04-logical-dfd-example-grocery-store.png\"\/><\/p>\n<p style=\"text-align: center\"><a class=\"edit-template-v1\" href=\"https:\/\/online.visual-paradigm.com\/app\/diagrams\/#diagram:proj=0&amp;type=DataFlowDiagram&amp;gallery=\/repository\/17b473be-0da9-4364-ad58-1910f57014ea.xml&amp;name=Logical%20Data%20Flow%20Diagram%20Example%3A%20Grocery%20Store\">Ch\u1ec9nh s\u1eeda v\u00ed d\u1ee5 DFD logic n\u00e0y<\/a><\/p>\n<h3>V\u00ed d\u1ee5 DFD v\u1eadt l\u00fd \u2013 C\u1eeda h\u00e0ng t\u1ea1p h\u00f3a<\/h3>\n<ul>\n<li>DFD v\u1eadt l\u00fd cho th\u1ea5y r\u1eb1ng m\u1ed9t m\u00e3 v\u1ea1ch &#8211; m\u00e3 gi\u00e1 UPC \u0111\u01b0\u1ee3c t\u00ecm th\u1ea5y tr\u00ean h\u1ea7u h\u1ebft c\u00e1c m\u1eb7t h\u00e0ng trong c\u1eeda h\u00e0ng t\u1ea1p h\u00f3a \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng<\/li>\n<li>Ngo\u00e0i ra, DFD v\u1eadt l\u00fd \u0111\u1ec1 c\u1eadp \u0111\u1ebfn c\u00e1c quy tr\u00ecnh th\u1ee7 c\u00f4ng nh\u01b0 qu\u00e9t, gi\u1ea3i th\u00edch r\u1eb1ng m\u1ed9t t\u1ec7p t\u1ea1m th\u1eddi \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 gi\u1eef t\u1ed5ng ph\u1ee5 c\u1ee7a c\u00e1c m\u1eb7t h\u00e0ng<\/li>\n<li>Vi\u1ec7c THANH TO\u00c1N c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n b\u1eb1ng TI\u1ec0N M\u1eb6T, S\u00c9C ho\u1eb7c TH\u1eba GHI N\u1ee2<\/li>\n<\/ul>\n<p>Cu\u1ed1i c\u00f9ng, n\u00f3 \u0111\u1ec1 c\u1eadp \u0111\u1ebfn bi\u00ean lai b\u1eb1ng t\u00ean c\u1ee7a n\u00f3, BI\u00caN LAI QU\u1ea6Y THU NG\u00c2N<\/p>\n<p><img class=\"aligncenter\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/physical-data-flow-diagram-example-grocery-store.png\"\/><\/p>\n<p style=\"text-align: center\"><a class=\"edit-template-v1\" href=\"https:\/\/online.visual-paradigm.com\/app\/diagrams\/#diagram:proj=0&amp;type=DataFlowDiagram&amp;gallery=\/repository\/00c294fb-3145-4708-bc8c-e3e2c42bdf14.xml&amp;name=Physical%20Data%20Flow%20Diagram%20Example%3A%20Grocery%20Store\">Ch\u1ec9nh s\u1eeda v\u00ed d\u1ee5 DFD v\u1eadt l\u00fd n\u00e0y<\/a><\/p>\n<h3>M\u1eb9o v\u00e0 Ghi ch\u00fa v\u1ec1 S\u01a1 \u0111\u1ed3 D\u00f2ng D\u1eef li\u1ec7u<\/h3>\n<ul>\n<li>\u0110\u1eebng l\u00e0m cho n\u00f3 qu\u00e1 ph\u1ee9c t\u1ea1p; th\u01b0\u1eddng th\u00ec 5-7 ng\u01b0\u1eddi trung b\u00ecnh c\u00f3 th\u1ec3 qu\u1ea3n l\u00fd c\u00e1c quy tr\u00ecnh<\/li>\n<li>M\u1ed9t <a href=\"https:\/\/faculty.babson.edu\/dewire\/readings\/dfdmistk.htm\">kho d\u1eef li\u1ec7u<\/a> ph\u1ea3i \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi \u00edt nh\u1ea5t m\u1ed9t quy tr\u00ecnh<\/li>\n<li>D\u00f2ng d\u1eef li\u1ec7u kh\u00f4ng n\u00ean t\u1ed3n t\u1ea1i gi\u1eefa 2 th\u1ef1c th\u1ec3 b\u00ean ngo\u00e0i m\u00e0 kh\u00f4ng qua m\u1ed9t quy tr\u00ecnh<\/li>\n<li>M\u1ed9t quy tr\u00ecnh c\u00f3 \u0111\u1ea7u v\u00e0o nh\u01b0ng kh\u00f4ng c\u00f3 \u0111\u1ea7u ra \u0111\u01b0\u1ee3c coi l\u00e0 quy tr\u00ecnh h\u1ed1 \u0111en.<\/li>\n<li>Nh\u1eefng nh\u00e3n quy tr\u00ecnh n\u00ean l\u00e0 c\u1ee5m \u0111\u1ed9ng t\u1eeb; kho d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c \u0111\u1ea1i di\u1ec7n b\u1edfi danh t\u1eeb.<\/li>\n<li>M\u1ed9t th\u1ef1c th\u1ec3 b\u00ean ngo\u00e0i ph\u1ea3i \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi \u00edt nh\u1ea5t m\u1ed9t quy tr\u00ecnh<\/li>\n<li>DFD l\u00e0 kh\u00f4ng x\u00e1c \u0111\u1ecbnh \u2013 vi\u1ec7c \u0111\u00e1nh s\u1ed1 kh\u00f4ng nh\u1ea5t thi\u1ebft ch\u1ec9 ra th\u1ee9 t\u1ef1 v\u00e0 h\u1eefu \u00edch cho vi\u1ec7c x\u00e1c \u0111\u1ecbnh c\u00e1c quy tr\u00ecnh khi th\u1ea3o lu\u1eadn v\u1edbi ng\u01b0\u1eddi d\u00f9ng<\/li>\n<li>Kho d\u1eef li\u1ec7u kh\u00f4ng n\u00ean \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i v\u1edbi m\u1ed9t th\u1ef1c th\u1ec3 b\u00ean ngo\u00e0i, n\u1ebfu kh\u00f4ng, \u0111i\u1ec1u \u0111\u00f3 c\u00f3 ngh\u0129a l\u00e0 b\u1ea1n \u0111ang cung c\u1ea5p cho m\u1ed9t th\u1ef1c th\u1ec3 b\u00ean ngo\u00e0i quy\u1ec1n truy c\u1eadp tr\u1ef1c ti\u1ebfp v\u00e0o t\u1ec7p d\u1eef li\u1ec7u c\u1ee7a b\u1ea1n<\/li>\n<\/ul>\n<p><strong>T\u00e0i nguy\u00ean<\/strong><\/p>\n<ul>\n<li><a href=\"https:\/\/www.visual-paradigm.com\/tutorials\/data-flow-diagram-dfd.jsp\">S\u01a1 \u0111\u1ed3 D\u00f2ng D\u1eef li\u1ec7u (DFD) l\u00e0 g\u00ec?<\/a><\/li>\n<li><a href=\"https:\/\/www.visual-paradigm.com\/tutorials\/how-to-create-data-flow-diagram\/\">C\u00e1ch t\u1ea1o S\u01a1 \u0111\u1ed3 D\u00f2ng D\u1eef li\u1ec7u (DFD)?<\/a><\/li>\n<li><a href=\"https:\/\/www.visual-paradigm.com\/solution\/drawdfd\/\">Ph\u1ea7n m\u1ec1m S\u01a1 \u0111\u1ed3 D\u00f2ng D\u1eef li\u1ec7u (DFD)<\/a><\/li>\n<li><a href=\"https:\/\/online.visual-paradigm.com\/diagrams\/templates\/data-flow-diagram\/\">V\u00ed d\u1ee5 v\u1ec1 S\u01a1 \u0111\u1ed3 D\u00f2ng D\u1eef li\u1ec7u<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>S\u01a1 \u0111\u1ed3 lu\u1ed3ng d\u1eef li\u1ec7u l\u00e0 g\u00ec? M\u1ed9t s\u01a1 \u0111\u1ed3 lu\u1ed3ng d\u1eef li\u1ec7ul\u00e0 m\u1ed9t bi\u1ec3u di\u1ec5n \u0111\u1ed3 h\u1ecda v\u1ec1 lu\u1ed3ng<\/p>\n","protected":false},"author":1,"featured_media":9445,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"","footnotes":""},"categories":[69],"tags":[52,63,62,53],"class_list":["post-8984","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-modeling","tag-cn-done","tag-es-done","tag-ja-done","tag-tw-done"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>S\u01a1 \u0111\u1ed3 lu\u1ed3ng d\u1eef li\u1ec7u - M\u1ed9t h\u01b0\u1edbng d\u1eabn to\u00e0n di\u1ec7n - Cybermedian<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.cybermedian.com\/vn\/data-flow-diagram-a-comprehensive-tutorial\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"S\u01a1 \u0111\u1ed3 lu\u1ed3ng d\u1eef li\u1ec7u - M\u1ed9t h\u01b0\u1edbng d\u1eabn to\u00e0n di\u1ec7n - Cybermedian\" \/>\n<meta property=\"og:description\" content=\"S\u01a1 \u0111\u1ed3 lu\u1ed3ng d\u1eef li\u1ec7u l\u00e0 g\u00ec? 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