{"id":528,"date":"2022-01-26T01:28:21","date_gmt":"2022-01-26T01:28:21","guid":{"rendered":"https:\/\/www.cybermedian.com\/vn\/?p=528"},"modified":"2025-02-17T11:23:25","modified_gmt":"2025-02-17T03:23:25","slug":"what-is-data-flow-diagram-why-it-is-still-useful-for-software-development","status":"publish","type":"post","link":"https:\/\/www.cybermedian.com\/vn\/what-is-data-flow-diagram-why-it-is-still-useful-for-software-development\/","title":{"rendered":"S\u01a1 \u0111\u1ed3 lu\u1ed3ng d\u1eef li\u1ec7u l\u00e0 g\u00ec, t\u1ea1i sao n\u00f3 v\u1eabn h\u1eefu \u00edch cho ph\u00e1t tri\u1ec3n ph\u1ea7n m\u1ec1m?"},"content":{"rendered":"<section class=\"section section--body section--first\">\n<div class=\"section-content\">\n<div class=\"section-inner sectionLayout--insetColumn\">\n<p class=\"graf graf--p graf-after--h3\" id=\"dbcd\">M\u1ed9t <a class=\"markup--anchor markup--p-anchor\" data-href=\"https:\/\/www.visual-paradigm.com\/guide\/data-flow-diagram\/what-is-data-flow-diagram\/\" href=\"https:\/\/www.visual-paradigm.com\/guide\/data-flow-diagram\/what-is-data-flow-diagram\/\" rel=\"noopener\" target=\"_blank\">m\u00f4 h\u00ecnh lu\u1ed3ng d\u1eef li\u1ec7u<\/a>l\u00e0 m\u1ed9t c\u00e1ch tr\u1ef1c quan \u0111\u1ec3 th\u1ec3 hi\u1ec7n c\u00e1ch m\u00e0 m\u1ed9t h\u1ec7 th\u1ed1ng x\u1eed l\u00fd d\u1eef li\u1ec7u. \u1ede c\u1ea5p \u0111\u1ed9 ph\u00e2n t\u00edch, ch\u00fang n\u00ean \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 m\u00f4 h\u00ecnh h\u00f3a c\u00e1ch d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c x\u1eed l\u00fd trong c\u00e1c h\u1ec7 th\u1ed1ng hi\u1ec7n c\u00f3.<\/p>\n<p class=\"graf graf--p graf-after--p\" id=\"9b9e\">Sau khi c\u00f4ng b\u1ed1 <a class=\"markup--anchor markup--p-anchor\" data-href=\"http:\/\/DFD Using Yourdon and DeMarco Notation\" href=\"http:\/\/DFD%20Using%20Yourdon%20and%20DeMarco%20Notation\" rel=\"noopener\" target=\"_blank\">cu\u1ed1n s\u00e1ch Ph\u00e2n t\u00edch H\u1ec7 th\u1ed1ng C\u1ea5u tr\u00fac c\u1ee7a DeMarco,<\/a>, m\u00f4 h\u00ecnh lu\u1ed3ng d\u1eef li\u1ec7u \u0111\u00e3 tr\u1edf n\u00ean ng\u00e0y c\u00e0ng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i trong ph\u00e2n t\u00edch. Ch\u00fang l\u00e0 m\u1ed9t ph\u1ea7n kh\u00f4ng th\u1ec3 thi\u1ebfu c\u1ee7a ph\u01b0\u01a1ng ph\u00e1p c\u1ea5u tr\u00fac ph\u00e1t tri\u1ec3n t\u1eeb c\u00f4ng vi\u1ec7c n\u00e0y. C\u00e1c k\u00fd hi\u1ec7u \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong nh\u1eefng m\u00f4 h\u00ecnh n\u00e0y \u0111\u1ea1i di\u1ec7n cho x\u1eed l\u00fd ch\u1ee9c n\u0103ng (h\u00ecnh ch\u1eef nh\u1eadt bo g\u00f3c), l\u01b0u tr\u1eef d\u1eef li\u1ec7u (h\u00ecnh ch\u1eef nh\u1eadt), v\u00e0 di chuy\u1ec3n d\u1eef li\u1ec7u gi\u1eefa c\u00e1c ch\u1ee9c n\u0103ng (m\u0169i t\u00ean c\u00f3 nh\u00e3n).<\/p>\n<h3 class=\"graf graf--h3 graf-after--p\" id=\"5137\">T\u1ea1i sao DFD v\u1eabn h\u1eefu \u00edch cho ph\u00e1t tri\u1ec3n ph\u1ea7n m\u1ec1m?<\/h3>\n<p class=\"graf graf--p graf-after--h3\" id=\"5d71\">M\u1eb7c d\u00f9 <a class=\"markup--anchor markup--p-anchor\" data-href=\"https:\/\/en.wikipedia.org\/wiki\/Data-flow_diagram\" href=\"https:\/\/en.wikipedia.org\/wiki\/Data-flow_diagram\" rel=\"noopener\" target=\"_blank\">m\u00f4 h\u00ecnh h\u00f3a \u0111\u1ecbnh h\u01b0\u1edbng lu\u1ed3ng d\u1eef li\u1ec7u<\/a>\u0111\u01b0\u1ee3c coi l\u00e0 m\u1ed9t c\u00f4ng ngh\u1ec7 l\u1ed7i th\u1eddi b\u1edfi m\u1ed9t s\u1ed1 k\u1ef9 s\u01b0 ph\u1ea7n m\u1ec1m, nh\u01b0ng n\u00f3 v\u1eabn l\u00e0 m\u1ed9t trong nh\u1eefng k\u00fd hi\u1ec7u ph\u00e2n t\u00edch y\u00eau c\u1ea7u \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i nh\u1ea5t. M\u1eb7c d\u00f9 s\u01a1 \u0111\u1ed3 lu\u1ed3ng d\u1eef li\u1ec7u (DFD) kh\u00f4ng ph\u1ea3i l\u00e0 c\u00e1c ph\u1ea7n ch\u00ednh th\u1ee9c c\u1ee7a UML, nh\u01b0ng ch\u00fang c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 b\u1ed5 sung cho c\u00e1c s\u01a1 \u0111\u1ed3 UML v\u00e0 cung c\u1ea5p th\u00eam c\u00e1i nh\u00ecn s\u00e2u s\u1eafc v\u1ec1 y\u00eau c\u1ea7u v\u00e0 quy tr\u00ecnh c\u1ee7a h\u1ec7 th\u1ed1ng.<\/p>\n<p class=\"graf graf--p graf-after--p\" id=\"6c71\">M\u00f4 h\u00ecnh lu\u1ed3ng d\u1eef li\u1ec7u c\u00f3 gi\u00e1 tr\u1ecb v\u00ec vi\u1ec7c theo d\u00f5i v\u00e0 ghi l\u1ea1i c\u00e1ch d\u1eef li\u1ec7u li\u00ean quan \u0111\u1ebfn m\u1ed9t quy tr\u00ecnh c\u1ee5 th\u1ec3 di chuy\u1ec3n qua h\u1ec7 th\u1ed1ng gi\u00fap c\u00e1c nh\u00e0 ph\u00e2n t\u00edch hi\u1ec3u nh\u1eefng g\u00ec \u0111ang x\u1ea3y ra. L\u1ee3i th\u1ebf c\u1ee7a s\u01a1 \u0111\u1ed3 lu\u1ed3ng d\u1eef li\u1ec7u l\u00e0, kh\u00e1c v\u1edbi m\u1ed9t s\u1ed1 k\u00fd hi\u1ec7u m\u00f4 h\u00ecnh kh\u00e1c, ch\u00fang \u0111\u01a1n gi\u1ea3n v\u00e0 tr\u1ef1c quan. Ch\u00fang th\u01b0\u1eddng c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c gi\u1ea3i th\u00edch cho nh\u1eefng ng\u01b0\u1eddi d\u00f9ng h\u1ec7 th\u1ed1ng ti\u1ec1m n\u0103ng c\u00f3 th\u1ec3 tham gia v\u00e0o vi\u1ec7c ph\u00e2n t\u00edch v\u00e0 x\u00e1c th\u1ef1c c\u00e1c y\u00eau c\u1ea7u.<\/p>\n<h4 class=\"graf graf--h4 graf-after--p\" id=\"4d4c\">T\u1ea1i sao DFD?<\/h4>\n<p class=\"graf graf--p graf-after--h4\" id=\"248b\">DFD bi\u1ec3u di\u1ec5n \u0111\u1ed3 h\u1ecda c\u00e1c ch\u1ee9c n\u0103ng, ho\u1eb7c quy tr\u00ecnh, m\u00e0 thu th\u1eadp, thao t\u00e1c, l\u01b0u tr\u1eef v\u00e0 ph\u00e2n ph\u1ed1i d\u1eef li\u1ec7u gi\u1eefa m\u1ed9t h\u1ec7 th\u1ed1ng v\u00e0 m\u00f4i tr\u01b0\u1eddng c\u1ee7a n\u00f3 c\u0169ng nh\u01b0 gi\u1eefa c\u00e1c th\u00e0nh ph\u1ea7n c\u1ee7a m\u1ed9t h\u1ec7 th\u1ed1ng. S\u1ef1 bi\u1ec3u di\u1ec5n tr\u1ef1c quan l\u00e0m cho n\u00f3 tr\u1edf th\u00e0nh m\u1ed9t c\u00f4ng c\u1ee5 giao ti\u1ebfp t\u1ed1t gi\u1eefa Ng\u01b0\u1eddi d\u00f9ng v\u00e0 Nh\u00e0 thi\u1ebft k\u1ebf H\u1ec7 th\u1ed1ng. C\u1ea5u tr\u00fac c\u1ee7a DFD cho ph\u00e9p b\u1eaft \u0111\u1ea7u t\u1eeb m\u1ed9t c\u00e1i nh\u00ecn t\u1ed5ng qu\u00e1t r\u1ed9ng v\u00e0 m\u1edf r\u1ed9ng n\u00f3 th\u00e0nh m\u1ed9t h\u1ec7 th\u1ed1ng ph\u00e2n c\u1ea5p c\u00e1c s\u01a1 \u0111\u1ed3 chi ti\u1ebft. DFD th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng v\u00ec nh\u1eefng l\u00fd do sau:<\/p>\n<ul class=\"postList\">\n<li class=\"graf graf--li graf-after--p\" id=\"4521\">Lu\u1ed3ng th\u00f4ng tin logic c\u1ee7a h\u1ec7 th\u1ed1ng<\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"720b\">X\u00e1c \u0111\u1ecbnh c\u00e1c y\u00eau c\u1ea7u x\u00e2y d\u1ef1ng h\u1ec7 th\u1ed1ng v\u1eadt l\u00fd<\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"f707\">S\u1ef1 \u0111\u01a1n gi\u1ea3n c\u1ee7a k\u00fd hi\u1ec7u<\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"c92f\">Thi\u1ebft l\u1eadp c\u00e1c y\u00eau c\u1ea7u c\u1ee7a h\u1ec7 th\u1ed1ng th\u1ee7 c\u00f4ng v\u00e0 t\u1ef1 \u0111\u1ed9ng<\/li>\n<\/ul>\n<h3 class=\"graf graf--h3 graf-after--li\" id=\"bd2d\">DFD l\u00e0 m\u1ed9t quy tr\u00ecnh ph\u00e2n r\u00e3 t\u1eeb tr\u00ean xu\u1ed1ng<\/h3>\n<p class=\"graf graf--p graf-after--h3\" id=\"6cf8\">M\u00f4 h\u00ecnh h\u00f3a lu\u1ed3ng d\u1eef li\u1ec7u l\u00e0 m\u1ed9t quy tr\u00ecnh \u201ct\u1eeb tr\u00ean xu\u1ed1ng\u201d. \u0110\u1ea7u ti\u00ean ph\u00e2n t\u00edch to\u00e0n b\u1ed9 quy tr\u00ecnh mua s\u1eafm. C\u00e1c quy tr\u00ecnh con sau \u0111\u00f3 \u0111\u01b0\u1ee3c ph\u00e2n t\u00edch theo c\u00e1ch ph\u00e2n r\u00e3 t\u1eeb tr\u00ean xu\u1ed1ng.<\/p>\n<p class=\"graf graf--p graf-after--p\" id=\"b22f\">DFD c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 m\u00f4 h\u00ecnh h\u00f3a c\u00e1c h\u1ec7 th\u1ed1ng ho\u1eb7c ph\u1ea7n m\u1ec1m \u1edf b\u1ea5t k\u1ef3 c\u1ea5p \u0111\u1ed9 tr\u1eebu t\u01b0\u1ee3ng n\u00e0o. Nh\u01b0 \u0111\u00e3 \u0111\u1ec1 c\u1eadp tr\u01b0\u1edbc \u0111\u00f3, DFD c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c chia th\u00e0nh c\u00e1c c\u1ea5p \u0111\u1ed9 \u0111\u1ea1i di\u1ec7n cho lu\u1ed3ng th\u00f4ng tin v\u00e0 chi ti\u1ebft ch\u1ee9c n\u0103ng ng\u00e0y c\u00e0ng t\u0103ng. C\u00e1c s\u1ed1 c\u1ea5p \u0111\u1ed9 trong DFD l\u00e0 0, 1, 2 ho\u1eb7c cao h\u01a1n. \u1ede \u0111\u00e2y, ch\u00fang ta s\u1ebd th\u1ea5y r\u1eb1ng c\u00f3 ba c\u1ea5p \u0111\u1ed9 ch\u00ednh trong s\u01a1 \u0111\u1ed3 lu\u1ed3ng d\u1eef li\u1ec7u, \u0111\u00f3 l\u00e0, DFD c\u1ea5p 0, DFD c\u1ea5p 1 v\u00e0 DFD c\u1ea5p 2.<\/p>\n<figure class=\"graf graf--figure graf-after--p\" id=\"d663\"><img class=\"graf-image\" data-height=\"577\" data-image-id=\"0*DTnOV6N4nnYaG-1l.png\" data-is-featured=\"true\" data-width=\"886\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/01\/0DTnOV6N4nnYaG-1l.png\"\/><figcaption class=\"imageCaption\">Quy tr\u00ecnh ph\u00e2n r\u00e3 t\u1eeb tr\u00ean xu\u1ed1ng DFD<\/figcaption><\/figure>\n<h4 class=\"graf graf--h4 graf-after--figure\" id=\"e685\">S\u01a1 \u0111\u1ed3 ng\u1eef c\u1ea3nh\u200a\u2014\u200aC\u00e1c c\u1ea5p \u0111\u1ed9 c\u1ee7a DFD<\/h4>\n<p class=\"graf graf--p graf-after--h4\" id=\"7108\">S\u01a1 \u0111\u1ed3 ng\u1eef c\u1ea3nh (c\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 DFD c\u1ea5p 0), n\u00f3 \u0111\u1ea1i di\u1ec7n cho to\u00e0n b\u1ed9 y\u00eau c\u1ea7u ph\u1ea7n m\u1ec1m nh\u01b0 m\u1ed9t bong b\u00f3ng, v\u1edbi d\u1eef li\u1ec7u \u0111\u1ea7u v\u00e0o v\u00e0 \u0111\u1ea7u ra \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng c\u00e1c m\u0169i t\u00ean \u0111\u1ea7u v\u00e0o v\u00e0 \u0111\u1ea7u ra.<\/p>\n<p class=\"graf graf--p graf-after--p\" id=\"319a\">H\u1ec7 th\u1ed1ng sau \u0111\u00f3 \u0111\u01b0\u1ee3c ph\u00e2n r\u00e3 th\u00e0nh m\u1ed9t DFD v\u1edbi nhi\u1ec1u bong b\u00f3ng. C\u00e1c ph\u1ea7n c\u1ee7a h\u1ec7 th\u1ed1ng \u0111\u01b0\u1ee3c \u0111\u1ea1i di\u1ec7n b\u1edfi m\u1ed7i bong b\u00f3ng sau \u0111\u00f3 \u0111\u01b0\u1ee3c ph\u00e2n t\u00e1ch v\u00e0 ghi l\u1ea1i v\u00e0o c\u00e1c s\u01a1 \u0111\u1ed3 lu\u1ed3ng d\u1eef li\u1ec7u ng\u00e0y c\u00e0ng chi ti\u1ebft. Quy tr\u00ecnh n\u00e0y c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c l\u1eb7p l\u1ea1i \u1edf c\u00e1c c\u1ea5p \u0111\u1ed9 c\u1ea7n thi\u1ebft cho \u0111\u1ebfn khi ch\u01b0\u01a1ng tr\u00ecnh hi\u1ec7n t\u1ea1i \u0111\u01b0\u1ee3c hi\u1ec3u \u0111\u1ea7y \u0111\u1ee7.<\/p>\n<p class=\"graf graf--p graf-after--p\" id=\"c5c4\">S\u1ed1 l\u01b0\u1ee3ng \u0111\u1ea7u v\u00e0o v\u00e0 \u0111\u1ea7u ra gi\u1eefa c\u00e1c c\u1ea5p \u0111\u1ed9 ph\u1ea3i \u0111\u01b0\u1ee3c duy tr\u00ec, m\u1ed9t kh\u00e1i ni\u1ec7m \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 ph\u00e2n c\u1ea5p DeMacro. Do \u0111\u00f3, n\u1ebfu bong b\u00f3ng \u201cA\u201d c\u00f3 hai \u0111\u1ea7u v\u00e0o X1 v\u00e0 X2 v\u00e0 m\u1ed9t \u0111\u1ea7u ra Y, th\u00ec s\u01a1 \u0111\u1ed3 lu\u1ed3ng d\u1eef li\u1ec7u c\u1ea5p con \u0111\u1ea1i di\u1ec7n cho DFD c\u1ea5p tr\u00ean \u201cA\u201d n\u00ean c\u00f3 ch\u00ednh x\u00e1c hai \u0111\u1ea7u v\u00e0o b\u00ean ngo\u00e0i v\u00e0 m\u1ed9t \u0111\u1ea7u ra b\u00ean ngo\u00e0i.<\/p>\n<p class=\"graf graf--p graf-after--p\" id=\"a817\">Trong DFD c\u1ea5p 1, s\u01a1 \u0111\u1ed3 ng\u1eef c\u1ea3nh \u0111\u01b0\u1ee3c ph\u00e2n r\u00e3 th\u00e0nh nhi\u1ec1u quy tr\u00ecnh. \u1ede c\u1ea5p \u0111\u1ed9 n\u00e0y, ch\u00fang t\u00f4i l\u00e0m n\u1ed5i b\u1eadt c\u00e1c ch\u1ee9c n\u0103ng ch\u00ednh c\u1ee7a h\u1ec7 th\u1ed1ng v\u00e0 ph\u00e2n t\u00e1ch quy tr\u00ecnh c\u1ea5p cao c\u1ee7a DFD c\u1ea5p 0 th\u00e0nh c\u00e1c quy tr\u00ecnh con \u0111\u1ec3 \u0111\u1ea1i di\u1ec7n cho c\u00e1c chi ti\u1ebft c\u1ee7a c\u00e1c ho\u1ea1t \u0111\u1ed9ng x\u1eed l\u00fd.<\/p>\n<p class=\"graf graf--p graf-after--p\" id=\"5243\"><strong class=\"markup--strong markup--p-strong\">S\u01a1 \u0111\u1ed3 ng\u1eef c\u1ea3nh (DFD c\u1ea5p 0)\u200a<\/strong>\u2014\u200am\u1ed9t s\u01a1 \u0111\u1ed3 ng\u1eef c\u1ea3nh DFD l\u00e0 m\u1ed9t s\u01a1 \u0111\u1ed3 \u0111\u1ea1i di\u1ec7n cho c\u00e1i nh\u00ecn t\u1ed5ng quan v\u1ec1 h\u1ec7 th\u1ed1ng v\u00e0 s\u1ef1 t\u01b0\u01a1ng t\u00e1c c\u1ee7a n\u00f3 v\u1edbi ph\u1ea7n c\u00f2n l\u1ea1i c\u1ee7a \u201cth\u1ebf gi\u1edbi\u201d.<\/p>\n<p class=\"graf graf--p graf-after--p\" id=\"f289\"><strong class=\"markup--strong markup--p-strong\">S\u01a1 \u0111\u1ed3 lu\u1ed3ng d\u1eef li\u1ec7u c\u1ea5p 1<\/strong>\u200a\u2014\u200aDFD c\u1ea5p 1 cung c\u1ea5p 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 n\u00ean to\u00e0n b\u1ed9 h\u1ec7 th\u1ed1ng.<\/p>\n<p class=\"graf graf--p graf-after--p\" id=\"7f01\"><strong class=\"markup--strong markup--p-strong\">C\u1ea5p 2 (ho\u1eb7c th\u1ea5p h\u01a1n)<\/strong>\u200a\u2014\u200am\u1ed9t l\u1ee3i th\u1ebf l\u1edbn c\u1ee7a c\u00f4ng ngh\u1ec7 m\u00f4 h\u00ecnh h\u00f3a lu\u1ed3ng d\u1eef li\u1ec7u l\u00e0 s\u1ef1 ph\u1ee9c t\u1ea1p chi ti\u1ebft c\u1ee7a c\u00e1c h\u1ec7 th\u1ed1ng th\u1ef1c t\u1ebf c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c qu\u1ea3n l\u00fd v\u00e0 m\u00f4 h\u00ecnh h\u00f3a \u1edf c\u1ea5p \u0111\u1ed9 tr\u1eebu t\u01b0\u1ee3ng th\u00f4ng qua m\u1ed9t c\u00f4ng ngh\u1ec7 g\u1ecdi l\u00e0 \u201cph\u00e2n c\u1ea5p\u201d. M\u1ed9t s\u1ed1 y\u1ebfu t\u1ed1 c\u1ee7a b\u1ea5t k\u1ef3 s\u01a1 \u0111\u1ed3 lu\u1ed3ng d\u1eef li\u1ec7u n\u00e0o c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c ph\u00e2n r\u00e3 (\u201cph\u00e2n r\u00e3\u201d) th\u00e0nh m\u1ed9t m\u00f4 h\u00ecnh chi ti\u1ebft h\u01a1n \u1edf c\u1ea5p \u0111\u1ed9 th\u1ea5p h\u01a1n trong h\u1ec7 th\u1ed1ng ph\u00e2n c\u1ea5p.<\/p>\n<h3 class=\"graf graf--h3 graf-after--p\" id=\"8d01\">C\u00e1c c\u1ea5p \u0111\u1ed9 DFD\u200a\u2014\u200aV\u00ed d\u1ee5<strong class=\"markup--strong markup--h3-strong\"><em class=\"markup--em markup--h3-em\">\u2014 H\u1ec7 th\u1ed1ng \u0110\u1eb7t m\u00f3n \u0103n<\/em><\/strong><\/h3>\n<p class=\"graf graf--p graf-after--h3\" id=\"7b50\"><strong class=\"markup--strong markup--p-strong\">C\u1ea5p 0<\/strong><\/p>\n<p class=\"graf graf--p graf-after--p\" id=\"e54b\">N\u00f3 c\u0169ng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 <strong class=\"markup--strong markup--p-strong\">s\u01a1 \u0111\u1ed3 ng\u1eef c\u1ea3nh<\/strong>. N\u00f3 \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 l\u00e0 m\u1ed9t c\u00e1i nh\u00ecn tr\u1eebu t\u01b0\u1ee3ng, cho th\u1ea5y h\u1ec7 th\u1ed1ng nh\u01b0 m\u1ed9t quy tr\u00ecnh duy nh\u1ea5t v\u1edbi m\u1ed1i quan h\u1ec7 c\u1ee7a n\u00f3 v\u1edbi c\u00e1c th\u1ef1c th\u1ec3 b\u00ean ngo\u00e0i.<\/p>\n<ul class=\"postList\">\n<li class=\"graf graf--li graf-after--p\" id=\"3c49\">S\u01a1 \u0111\u1ed3 ng\u1eef c\u1ea3nh ph\u1ea3i v\u1eeba trong m\u1ed9t trang.<\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"d17a\">T\u00ean quy tr\u00ecnh trong s\u01a1 \u0111\u1ed3 ng\u1eef c\u1ea3nh n\u00ean l\u00e0 t\u00ean c\u1ee7a h\u1ec7 th\u1ed1ng th\u00f4ng tin.<\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"be81\">V\u00ed d\u1ee5, H\u1ec7 th\u1ed1ng Ch\u1ea5m \u0111i\u1ec3m, H\u1ec7 th\u1ed1ng X\u1eed l\u00fd \u0110\u01a1n h\u00e0ng, H\u1ec7 th\u1ed1ng \u0110\u0103ng k\u00fd.<\/li>\n<\/ul>\n<figure class=\"graf graf--figure graf-after--li\" id=\"94f8\"><img class=\"graf-image\" data-height=\"296\" data-image-id=\"1*fgsircZo8sN8GJUaj3F7QA.png\" data-width=\"862\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/01\/1fgsircZo8sN8GJUaj3F7QA.png\"\/><figcaption class=\"imageCaption\"><em class=\"markup--em markup--figure-em\">H\u1ec7 th\u1ed1ng \u0110\u1eb7t m\u00f3n \u0103n\u200a\u2014\u200aS\u01a1 \u0111\u1ed3 ng\u1eef c\u1ea3nh\u200a\u2014\u200aDFD c\u1ea5p 0<\/em><\/figcaption><\/figure>\n<p class=\"graf graf--p graf-after--figure\" id=\"1a04\">Trong DFD c\u1ea5p 1, s\u01a1 \u0111\u1ed3 ng\u1eef c\u1ea3nh \u0111\u01b0\u1ee3c ph\u00e2n r\u00e3 th\u00e0nh nhi\u1ec1u quy tr\u00ecnh. \u1ede c\u1ea5p \u0111\u1ed9 n\u00e0y, ch\u00fang t\u00f4i l\u00e0m n\u1ed5i b\u1eadt c\u00e1c ch\u1ee9c n\u0103ng ch\u00ednh c\u1ee7a h\u1ec7 th\u1ed1ng v\u00e0 ph\u00e2n t\u00e1ch quy tr\u00ecnh c\u1ea5p cao c\u1ee7a DFD c\u1ea5p 0 th\u00e0nh c\u00e1c quy tr\u00ecnh con \u0111\u1ec3 \u0111\u1ea1i di\u1ec7n cho c\u00e1c chi ti\u1ebft c\u1ee7a c\u00e1c ho\u1ea1t \u0111\u1ed9ng x\u1eed l\u00fd.<\/p>\n<p class=\"graf graf--p graf-after--p\" id=\"901f\"><strong class=\"markup--strong markup--p-strong\"><em class=\"markup--em markup--p-em\">C\u1ea5p 1\u200a\u2014\u200aH\u1ec7 th\u1ed1ng \u0110\u1eb7t m\u00f3n \u0103n<\/em><\/strong><\/p>\n<p class=\"graf graf--p graf-after--p\" id=\"2869\">Trong DFD c\u1ea5p 1, s\u01a1 \u0111\u1ed3 ng\u1eef c\u1ea3nh \u0111\u01b0\u1ee3c ph\u00e2n r\u00e3 th\u00e0nh nhi\u1ec1u quy tr\u00ecnh. \u1ede c\u1ea5p \u0111\u1ed9 n\u00e0y, ch\u00fang t\u00f4i l\u00e0m n\u1ed5i b\u1eadt c\u00e1c ch\u1ee9c n\u0103ng ch\u00ednh c\u1ee7a h\u1ec7 th\u1ed1ng v\u00e0 ph\u00e2n t\u00e1ch quy tr\u00ecnh c\u1ea5p cao c\u1ee7a DFD c\u1ea5p 0 th\u00e0nh c\u00e1c quy tr\u00ecnh con \u0111\u1ec3 \u0111\u1ea1i di\u1ec7n cho c\u00e1c chi ti\u1ebft c\u1ee7a c\u00e1c ho\u1ea1t \u0111\u1ed9ng x\u1eed l\u00fd.<\/p>\n<figure class=\"graf graf--figure graf-after--p\" id=\"0e59\"><img class=\"graf-image\" data-height=\"467\" data-image-id=\"1*6dIMY1UE44SrDdFn-38jGQ.png\" data-width=\"839\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/01\/16dIMY1UE44SrDdFn-38jGQ.png\"\/><figcaption class=\"imageCaption\">DFD c\u1ea5p 1\u200a\u2014\u200aV\u00ed d\u1ee5 v\u1ec1 H\u1ec7 th\u1ed1ng \u0110\u1eb7t m\u00f3n \u0103n<\/figcaption><\/figure>\n<p class=\"graf graf--p graf-after--figure\" id=\"3fe7\">N\u1ebfu m\u1ed9t quy tr\u00ecnh c\u00f3 nhi\u1ec1u lu\u1ed3ng d\u1eef li\u1ec7u li\u00ean k\u1ebft gi\u1eefa m\u1ed9t v\u00e0i th\u1ef1c th\u1ec3 b\u00ean ngo\u00e0i, ch\u00fang ta c\u00f3 th\u1ec3 \u0111\u1ea7u ti\u00ean tr\u00edch xu\u1ea5t quy tr\u00ecnh c\u1ee5 th\u1ec3 \u0111\u00f3 v\u00e0 c\u00e1c th\u1ef1c th\u1ec3 b\u00ean ngo\u00e0i li\u00ean quan v\u00e0o m\u1ed9t s\u01a1 \u0111\u1ed3 ri\u00eang bi\u1ec7t t\u01b0\u01a1ng t\u1ef1 nh\u01b0 s\u01a1 \u0111\u1ed3 ng\u1eef c\u1ea3nh, tr\u01b0\u1edbc khi b\u1ea1n tinh ch\u1ec9nh quy tr\u00ecnh th\u00e0nh m\u1ed9t c\u1ea5p \u0111\u1ed9 DFD ri\u00eang bi\u1ec7t; v\u00e0 b\u1eb1ng c\u00e1ch n\u00e0y b\u1ea1n c\u00f3 th\u1ec3 \u0111\u1ea3m b\u1ea3o t\u00ednh nh\u1ea5t qu\u00e1n gi\u1eefa ch\u00fang d\u1ec5 d\u00e0ng h\u01a1n.<\/p>\n<h3 class=\"graf graf--h3 graf-after--p\" id=\"5e02\">K\u00fd hi\u1ec7u DFD<\/h3>\n<p class=\"graf graf--p graf-after--h3\" id=\"96ef\">C\u00f3 <strong class=\"markup--strong markup--p-strong\">b\u1ed1n k\u00fd hi\u1ec7u c\u01a1 b\u1ea3n<\/strong> \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 bi\u1ec3u di\u1ec5n m\u1ed9t s\u01a1 \u0111\u1ed3 lu\u1ed3ng d\u1eef li\u1ec7u.<\/p>\n<h3 class=\"graf graf--h3 graf-after--p\" id=\"689c\">Quy tr\u00ecnh<\/h3>\n<p class=\"graf graf--p graf-after--h3\" id=\"f695\">M\u1ed9t quy tr\u00ecnh nh\u1eadn d\u1eef li\u1ec7u \u0111\u1ea7u v\u00e0o v\u00e0 t\u1ea1o ra \u0111\u1ea7u ra v\u1edbi n\u1ed9i dung ho\u1eb7c h\u00ecnh th\u1ee9c kh\u00e1c. C\u00e1c quy tr\u00ecnh c\u00f3 th\u1ec3 \u0111\u01a1n gi\u1ea3n nh\u01b0 thu th\u1eadp d\u1eef li\u1ec7u \u0111\u1ea7u v\u00e0o v\u00e0 l\u01b0u tr\u1eef trong c\u01a1 s\u1edf d\u1eef li\u1ec7u, ho\u1eb7c c\u00f3 th\u1ec3 ph\u1ee9c t\u1ea1p nh\u01b0 t\u1ea1o ra m\u1ed9t b\u00e1o c\u00e1o ch\u1ee9a doanh s\u1ed1 b\u00e1n h\u00e0ng h\u00e0ng th\u00e1ng c\u1ee7a t\u1ea5t c\u1ea3 c\u00e1c c\u1eeda h\u00e0ng b\u00e1n l\u1ebb trong khu v\u1ef1c t\u00e2y b\u1eafc.<\/p>\n<p class=\"graf graf--p graf-after--p\" id=\"d4c3\">M\u1ed7i quy tr\u00ecnh c\u00f3 m\u1ed9t t\u00ean x\u00e1c \u0111\u1ecbnh ch\u1ee9c n\u0103ng m\u00e0 n\u00f3 th\u1ef1c hi\u1ec7n.<\/p>\n<p class=\"graf graf--p graf-after--p\" id=\"32f6\">T\u00ean g\u1ecdi bao g\u1ed3m m\u1ed9t \u0111\u1ed9ng t\u1eeb, theo sau l\u00e0 m\u1ed9t danh t\u1eeb s\u1ed1 \u00edt.<\/p>\n<p class=\"graf graf--p graf-after--p\" id=\"9161\">V\u00ed d\u1ee5:<\/p>\n<ul class=\"postList\">\n<li class=\"graf graf--li graf-after--p\" id=\"2180\">\u00c1p d\u1ee5ng thanh to\u00e1n<\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"8377\">T\u00ednh hoa h\u1ed3ng<\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"8e28\">X\u00e1c minh \u0111\u01a1n h\u00e0ng<\/li>\n<\/ul>\n<h4 class=\"graf graf--h4 graf-after--li\" id=\"4463\">K\u00fd hi\u1ec7u DFD<\/h4>\n<ul class=\"postList\">\n<li class=\"graf graf--li graf-after--h4\" id=\"b2b8\">M\u1ed9t h\u00ecnh ch\u1eef nh\u1eadt bo tr\u00f2n \u0111\u1ea1i di\u1ec7n cho m\u1ed9t quy tr\u00ecnh<\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"084f\">C\u00e1c quy tr\u00ecnh \u0111\u01b0\u1ee3c g\u00e1n ID \u0111\u1ec3 d\u1ec5 d\u00e0ng tham chi\u1ebfu<\/li>\n<\/ul>\n<figure class=\"graf graf--figure graf-after--li\" id=\"11da\"><img class=\"graf-image\" data-height=\"71\" data-image-id=\"0*EDe7N518PkPxVVLo.png\" data-width=\"377\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/01\/0EDe7N518PkPxVVLo.png\"\/><\/figure>\n<h4 class=\"graf graf--h4 graf-after--figure\" id=\"af8f\">V\u00ed d\u1ee5 v\u1ec1 quy tr\u00ecnh<\/h4>\n<figure class=\"graf graf--figure graf-after--h4\" id=\"5dfa\"><img class=\"graf-image\" data-height=\"140\" data-image-id=\"0*Ec6H3EPselPHna9t.png\" data-width=\"539\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/01\/0Ec6H3EPselPHna9t.png\"\/><\/figure>\n<h4 class=\"graf graf--h4 graf-after--figure\" id=\"8cfc\">Lu\u1ed3ng d\u1eef li\u1ec7u<\/h4>\n<p class=\"graf graf--p graf-after--h4\" id=\"d620\">M\u1ed9t lu\u1ed3ng d\u1eef li\u1ec7u l\u00e0 m\u1ed9t con \u0111\u01b0\u1eddng \u0111\u1ec3 d\u1eef li\u1ec7u di chuy\u1ec3n t\u1eeb m\u1ed9t ph\u1ea7n c\u1ee7a h\u1ec7 th\u1ed1ng th\u00f4ng tin sang m\u1ed9t ph\u1ea7n kh\u00e1c. M\u1ed9t lu\u1ed3ng d\u1eef li\u1ec7u c\u00f3 th\u1ec3 \u0111\u1ea1i di\u1ec7n cho m\u1ed9t ph\u1ea7n t\u1eed d\u1eef li\u1ec7u \u0111\u01a1n l\u1ebb nh\u01b0 ID Kh\u00e1ch h\u00e0ng ho\u1eb7c n\u00f3 c\u00f3 th\u1ec3 \u0111\u1ea1i di\u1ec7n cho m\u1ed9t t\u1eadp h\u1ee3p c\u00e1c ph\u1ea7n t\u1eed d\u1eef li\u1ec7u (ho\u1eb7c m\u1ed9t c\u1ea5u tr\u00fac d\u1eef li\u1ec7u).<\/p>\n<p class=\"graf graf--p graf-after--p\" id=\"7183\">V\u00ed d\u1ee5:<\/p>\n<ul class=\"postList\">\n<li class=\"graf graf--li graf-after--p\" id=\"ea21\">Th\u00f4ng tin_kh\u00e1ch_h\u00e0ng (H\u1ecd, T\u00ean, S\u1ed1 SS#, S\u1ed1 \u0111i\u1ec7n tho\u1ea1i, v.v.)<\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"e3d2\">Th\u00f4ng tin_\u0111\u01a1n_h\u00e0ng (M\u00e3\u0110\u01a1n, M\u1eb7t_h\u00e0ng, Ng\u00e0y\u0110\u1eb7tH\u00e0ng, IDKh\u00e1chH\u00e0ng, v.v.).<\/li>\n<\/ul>\n<h4 class=\"graf graf--h4 graf-after--li\" id=\"b4a9\">V\u00ed d\u1ee5 v\u1ec1 lu\u1ed3ng d\u1eef li\u1ec7u:<\/h4>\n<figure class=\"graf graf--figure graf-after--h4\" id=\"f6db\"><img class=\"graf-image\" data-height=\"140\" data-image-id=\"0*vzLEdbukTYs6Dvsf.png\" data-width=\"331\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/01\/0vzLEdbukTYs6Dvsf.png\"\/><\/figure>\n<h4 class=\"graf graf--h4 graf-after--figure\" id=\"876a\">K\u00fd hi\u1ec7u<\/h4>\n<ul class=\"postList\">\n<li class=\"graf graf--li graf-after--h4\" id=\"b617\">C\u00e1c \u0111\u01b0\u1eddng th\u1eb3ng v\u1edbi m\u0169i t\u00ean v\u00e0o l\u00e0 lu\u1ed3ng d\u1eef li\u1ec7u \u0111\u1ea7u v\u00e0o<\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"4326\">C\u00e1c \u0111\u01b0\u1eddng th\u1eb3ng v\u1edbi m\u0169i t\u00ean ra l\u00e0 lu\u1ed3ng d\u1eef li\u1ec7u \u0111\u1ea7u ra<\/li>\n<\/ul>\n<p class=\"graf graf--p graf-after--li\" id=\"e2fc\">L\u01b0u \u00fd r\u1eb1ng:<\/p>\n<p class=\"graf graf--p graf-after--p\" id=\"af07\">B\u1edfi v\u00ec m\u1ed7i quy tr\u00ecnh thay \u0111\u1ed5i d\u1eef li\u1ec7u t\u1eeb m\u1ed9t h\u00ecnh th\u1ee9c n\u00e0y sang h\u00ecnh th\u1ee9c kh\u00e1c, \u00edt nh\u1ea5t m\u1ed9t lu\u1ed3ng d\u1eef li\u1ec7u ph\u1ea3i v\u00e0o v\u00e0 m\u1ed9t lu\u1ed3ng d\u1eef li\u1ec7u ph\u1ea3i ra kh\u1ecfi m\u1ed7i k\u00fd hi\u1ec7u quy tr\u00ecnh.<\/p>\n<h3 class=\"graf graf--h3 graf-after--p\" id=\"2247\">Kho d\u1eef li\u1ec7u<\/h3>\n<p class=\"graf graf--p graf-after--h3\" id=\"ca21\">M\u1ed9t kho d\u1eef li\u1ec7u ho\u1eb7c kho l\u01b0u tr\u1eef d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong s\u01a1 \u0111\u1ed3 lu\u1ed3ng d\u1eef li\u1ec7u \u0111\u1ec3 bi\u1ec3u di\u1ec5n m\u1ed9t t\u00ecnh hu\u1ed1ng khi h\u1ec7 th\u1ed1ng ph\u1ea3i gi\u1eef l\u1ea1i d\u1eef li\u1ec7u v\u00ec m\u1ed9t ho\u1eb7c nhi\u1ec1u quy tr\u00ecnh c\u1ea7n s\u1eed d\u1ee5ng d\u1eef li\u1ec7u \u0111\u00e3 l\u01b0u tr\u1eef v\u00e0o m\u1ed9t th\u1eddi \u0111i\u1ec3m sau.<\/p>\n<h4 class=\"graf graf--h4 graf-after--p\" id=\"7137\">K\u00fd hi\u1ec7u<\/h4>\n<ul class=\"postList\">\n<li class=\"graf graf--li graf-after--h4\" id=\"51ca\">D\u1eef li\u1ec7u c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c ghi v\u00e0o kho d\u1eef li\u1ec7u, \u0111i\u1ec1u n\u00e0y \u0111\u01b0\u1ee3c th\u1ec3 hi\u1ec7n b\u1eb1ng m\u1ed9t m\u0169i t\u00ean ra<\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"d832\">D\u1eef li\u1ec7u c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u0111\u1ecdc t\u1eeb kho d\u1eef li\u1ec7u, \u0111i\u1ec1u n\u00e0y \u0111\u01b0\u1ee3c th\u1ec3 hi\u1ec7n b\u1eb1ng m\u1ed9t m\u0169i t\u00ean v\u00e0o.<\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"2f79\">C\u00e1c v\u00ed d\u1ee5 l\u00e0: h\u00e0ng t\u1ed3n kho, c\u00e1c kho\u1ea3n ph\u1ea3i thu, \u0111\u01a1n h\u00e0ng v\u00e0 thanh to\u00e1n h\u00e0ng ng\u00e0y.<\/li>\n<\/ul>\n<figure class=\"graf graf--figure graf-after--li\" id=\"778b\"><img class=\"graf-image\" data-height=\"41\" data-image-id=\"0*2k_6sJt529bF_gsS.png\" data-width=\"418\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/01\/02k_6sJt529bF_gsS.png\"\/><\/figure>\n<h4 class=\"graf graf--h4 graf-after--figure\" id=\"ea69\">V\u00ed d\u1ee5 v\u1ec1 kho d\u1eef li\u1ec7u<\/h4>\n<figure class=\"graf graf--figure graf-after--h4\" id=\"c483\"><img class=\"graf-image\" data-height=\"180\" data-image-id=\"0*569xERyhl7UZTw8E.png\" data-width=\"334\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/01\/0569xERyhl7UZTw8E.png\"\/><\/figure>\n<p class=\"graf graf--p graf-after--figure\" id=\"d1a8\">L\u01b0u \u00fd r\u1eb1ng:<\/p>\n<ul class=\"postList\">\n<li class=\"graf graf--li graf-after--p\" id=\"a221\">M\u1ed9t kho d\u1eef li\u1ec7u ph\u1ea3i \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i v\u1edbi m\u1ed9t quy tr\u00ecnh th\u00f4ng qua m\u1ed9t lu\u1ed3ng d\u1eef li\u1ec7u.<\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"43e5\">M\u1ed7i kho d\u1eef li\u1ec7u ph\u1ea3i c\u00f3 \u00edt nh\u1ea5t m\u1ed9t lu\u1ed3ng d\u1eef li\u1ec7u \u0111\u1ea7u v\u00e0o v\u00e0 \u00edt nh\u1ea5t m\u1ed9t lu\u1ed3ng d\u1eef li\u1ec7u \u0111\u1ea7u ra (ngay c\u1ea3 khi lu\u1ed3ng d\u1eef li\u1ec7u \u0111\u1ea7u ra l\u00e0 m\u1ed9t th\u00f4ng \u0111i\u1ec7p \u0111i\u1ec1u khi\u1ec3n ho\u1eb7c x\u00e1c nh\u1eadn).<\/li>\n<\/ul>\n<h3 class=\"graf graf--h3 graf-after--li\" id=\"bfa8\">Th\u1ef1c th\u1ec3 b\u00ean ngo\u00e0i<\/h3>\n<p class=\"graf graf--p graf-after--h3\" id=\"a752\">M\u1ed9t th\u1ef1c th\u1ec3 b\u00ean ngo\u00e0i l\u00e0 m\u1ed9t ng\u01b0\u1eddi, ph\u00f2ng ban, t\u1ed5 ch\u1ee9c b\u00ean ngo\u00e0i, ho\u1eb7c h\u1ec7 th\u1ed1ng th\u00f4ng tin kh\u00e1c cung c\u1ea5p d\u1eef li\u1ec7u cho h\u1ec7 th\u1ed1ng ho\u1eb7c nh\u1eadn \u0111\u1ea7u ra t\u1eeb h\u1ec7 th\u1ed1ng. C\u00e1c th\u1ef1c th\u1ec3 b\u00ean ngo\u00e0i l\u00e0 c\u00e1c th\u00e0nh ph\u1ea7n n\u1eb1m ngo\u00e0i ranh gi\u1edbi c\u1ee7a c\u00e1c h\u1ec7 th\u1ed1ng th\u00f4ng tin. Ch\u00fang \u0111\u1ea1i di\u1ec7n cho c\u00e1ch m\u00e0 h\u1ec7 th\u1ed1ng th\u00f4ng tin t\u01b0\u01a1ng t\u00e1c v\u1edbi th\u1ebf gi\u1edbi b\u00ean ngo\u00e0i.<\/p>\n<ul class=\"postList\">\n<li class=\"graf graf--li graf-after--p\" id=\"7bcf\">M\u1ed9t h\u00ecnh ch\u1eef nh\u1eadt \u0111\u1ea1i di\u1ec7n cho m\u1ed9t th\u1ef1c th\u1ec3 b\u00ean ngo\u00e0i<\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"0e0b\">Ch\u00fang cung c\u1ea5p d\u1eef li\u1ec7u ho\u1eb7c nh\u1eadn d\u1eef li\u1ec7u<\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"9d29\">Ch\u00fang kh\u00f4ng x\u1eed l\u00fd d\u1eef li\u1ec7u<\/li>\n<\/ul>\n<h4 class=\"graf graf--h4 graf-after--li\" id=\"d044\">K\u00fd hi\u1ec7u<\/h4>\n<ul class=\"postList\">\n<li class=\"graf graf--li graf-after--h4\" id=\"6ee1\">M\u1ed9t kh\u00e1ch h\u00e0ng g\u1eedi \u0111\u01a1n h\u00e0ng v\u00e0 sau \u0111\u00f3 nh\u1eadn h\u00f3a \u0111\u01a1n t\u1eeb h\u1ec7 th\u1ed1ng<\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"ab62\">M\u1ed9t nh\u00e0 cung c\u1ea5p ph\u00e1t h\u00e0nh h\u00f3a \u0111\u01a1n<\/li>\n<\/ul>\n<figure class=\"graf graf--figure graf-after--li\" id=\"c830\"><img class=\"graf-image\" data-height=\"41\" data-image-id=\"0*NKFTg1DoOboXpTc_.png\" data-width=\"390\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/01\/0NKFTg1DoOboXpTc.png\"\/><\/figure>\n<h4 class=\"graf graf--h4 graf-after--figure\" id=\"d473\">V\u00ed d\u1ee5 v\u1ec1 th\u1ef1c th\u1ec3 b\u00ean ngo\u00e0i<\/h4>\n<figure class=\"graf graf--figure graf-after--h4\" id=\"ca7d\"><img class=\"graf-image\" data-height=\"71\" data-image-id=\"0*hfTApAURxleMa6XZ.png\" data-width=\"311\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/01\/0hfTApAURxleMa6XZ.png\"\/><\/figure>\n<p class=\"graf graf--p graf-after--figure\" id=\"ff78\">L\u01b0u \u00fd r\u1eb1ng:<\/p>\n<ul class=\"postList\">\n<li class=\"graf graf--li graf-after--p\" id=\"4dfa\">C\u00e1c th\u1ef1c th\u1ec3 b\u00ean ngo\u00e0i c\u0169ng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 \u0111i\u1ec3m k\u1ebft th\u00fac v\u00ec ch\u00fang l\u00e0 ngu\u1ed3n d\u1eef li\u1ec7u ho\u1eb7c \u0111i\u1ec3m \u0111\u1ebfn cu\u1ed1i.<\/li>\n<li class=\"graf graf--li graf-after--li graf--trailing\" id=\"28a9\">M\u1ed9t th\u1ef1c th\u1ec3 b\u00ean ngo\u00e0i ph\u1ea3i \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i v\u1edbi m\u1ed9t quy tr\u00ecnh th\u00f4ng qua m\u1ed9t lu\u1ed3ng d\u1eef li\u1ec7u.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/section>\n<section class=\"section section--body section--last\">\n<div class=\"section-divider\">\n<hr class=\"section-divider\"\/>\n<\/div>\n<div class=\"section-content\">\n<div class=\"section-inner sectionLayout--insetColumn\">\n<h3 class=\"graf graf--h3 graf--leading\" id=\"df4f\">Quy t\u1eafc c\u1ee7a Lu\u1ed3ng D\u1eef li\u1ec7u<\/h3>\n<p class=\"graf graf--p graf-after--h3\" id=\"0441\">M\u1ed9t trong nh\u1eefng quy t\u1eafc \u0111\u1ec3 ph\u00e1t tri\u1ec3n DFD l\u00e0 t\u1ea5t c\u1ea3 c\u00e1c lu\u1ed3ng ph\u1ea3i b\u1eaft \u0111\u1ea7u v\u00e0 k\u1ebft th\u00fac t\u1ea1i m\u1ed9t b\u01b0\u1edbc x\u1eed l\u00fd. \u0110i\u1ec1u n\u00e0y kh\u00e1 h\u1ee3p l\u00fd, v\u00ec d\u1eef li\u1ec7u kh\u00f4ng th\u1ec3 t\u1ef1 bi\u1ebfn \u0111\u1ed5i m\u00e0 kh\u00f4ng c\u00f3 quy tr\u00ecnh. B\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng quy t\u1eafc ng\u00f3n tay c\u00e1i, r\u1ea5t d\u1ec5 d\u00e0ng \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh c\u00e1c lu\u1ed3ng d\u1eef li\u1ec7u b\u1ea5t h\u1ee3p ph\u00e1p v\u00e0 s\u1eeda ch\u1eefa ch\u00fang trong m\u1ed9t DFD.<\/p>\n<h4 class=\"graf graf--h4 graf-after--p\" id=\"96c2\">M\u00f4 t\u1ea3 Sai \/ \u0110\u00fang<\/h4>\n<figure class=\"graf graf--figure graf-after--h4\" id=\"8116\"><img class=\"graf-image\" data-height=\"42\" data-image-id=\"0*mO8fiwOTgYQuyRPL.png\" data-width=\"296\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/01\/0mO8fiwOTgYQuyRPL.png\"\/><\/figure>\n<figure class=\"graf graf--figure graf-after--figure\" id=\"2dd6\"><img class=\"graf-image\" data-height=\"71\" data-image-id=\"0*Y6pRNDUxux0qwlD0.png\" data-width=\"355\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/01\/0Y6pRNDUxux0qwlD0.png\"\/><\/figure>\n<p class=\"graf graf--p graf-after--figure\" id=\"6baa\">M\u1ed9t th\u1ef1c th\u1ec3 kh\u00f4ng th\u1ec3 cung c\u1ea5p d\u1eef li\u1ec7u cho m\u1ed9t th\u1ef1c th\u1ec3 kh\u00e1c m\u00e0 kh\u00f4ng c\u00f3 m\u1ed9t s\u1ed1 x\u1eed l\u00fd x\u1ea3y ra.<\/p>\n<figure class=\"graf graf--figure graf-after--p\" id=\"dd87\"><img class=\"graf-image\" data-height=\"42\" data-image-id=\"0*TPIsRd6pLvxKfuIc.png\" data-width=\"316\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/01\/0TPIsRd6pLvxKfuIc.png\"\/><\/figure>\n<figure class=\"graf graf--figure graf-after--figure\" id=\"d185\"><img class=\"graf-image\" data-height=\"71\" data-image-id=\"0*lihI4SPMnbJkeaFa.png\" data-width=\"375\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/01\/0lihI4SPMnbJkeaFa.png\"\/><\/figure>\n<p class=\"graf graf--p graf-after--figure\" id=\"8187\">D\u1eef li\u1ec7u kh\u00f4ng th\u1ec3 di chuy\u1ec3n tr\u1ef1c ti\u1ebfp t\u1eeb m\u1ed9t th\u1ef1c th\u1ec3 \u0111\u1ebfn m\u1ed9t kho d\u1eef li\u1ec7u m\u00e0 kh\u00f4ng \u0111\u01b0\u1ee3c x\u1eed l\u00fd.<\/p>\n<figure class=\"graf graf--figure graf-after--p\" id=\"df9c\"><img class=\"graf-image\" data-height=\"41\" data-image-id=\"0*k7BuGRnRgKJqzmpk.png\" data-width=\"316\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/01\/0k7BuGRnRgKJqzmpk.png\"\/><\/figure>\n<figure class=\"graf graf--figure graf-after--figure\" id=\"bbee\"><img class=\"graf-image\" data-height=\"71\" data-image-id=\"0*scBg7WRzIF69UTRK.png\" data-width=\"375\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/01\/0scBg7WRzIF69UTRK.png\"\/><\/figure>\n<p class=\"graf graf--p graf-after--figure\" id=\"da62\">D\u1eef li\u1ec7u kh\u00f4ng th\u1ec3 di chuy\u1ec3n tr\u1ef1c ti\u1ebfp t\u1eeb m\u1ed9t kho d\u1eef li\u1ec7u m\u00e0 kh\u00f4ng \u0111\u01b0\u1ee3c x\u1eed l\u00fd.<\/p>\n<figure class=\"graf graf--figure graf-after--p\" id=\"dc34\"><img class=\"graf-image\" data-height=\"41\" data-image-id=\"0*AZXi_Ona2406ZNT-.png\" data-width=\"336\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/01\/0AZXi_Ona2406ZNT.png\"\/><\/figure>\n<figure class=\"graf graf--figure graf-after--figure\" id=\"a005\"><img class=\"graf-image\" data-height=\"71\" data-image-id=\"0*2KaheQzAdmwNKcjr.png\" data-width=\"395\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/01\/02KaheQzAdmwNKcjr.png\"\/><\/figure>\n<p class=\"graf graf--p graf-after--figure\" id=\"a3f9\">D\u1eef li\u1ec7u kh\u00f4ng th\u1ec3 di chuy\u1ec3n tr\u1ef1c ti\u1ebfp t\u1eeb m\u1ed9t kho d\u1eef li\u1ec7u n\u00e0y sang m\u1ed9t kho d\u1eef li\u1ec7u kh\u00e1c m\u00e0 kh\u00f4ng \u0111\u01b0\u1ee3c x\u1eed l\u00fd.<\/p>\n<h3 class=\"graf graf--h3 graf-after--p\" id=\"1c08\">Nh\u1eefng sai l\u1ea7m th\u01b0\u1eddng g\u1eb7p kh\u00e1c trong DFD<\/h3>\n<p class=\"graf graf--p graf-after--h3\" id=\"b84a\">M\u1ed9t lo\u1ea1i sai l\u1ea7m th\u1ee9 hai trong DFD ph\u00e1t sinh khi c\u00e1c \u0111\u1ea7u ra t\u1eeb m\u1ed9t b\u01b0\u1edbc x\u1eed l\u00fd kh\u00f4ng kh\u1edbp v\u1edbi c\u00e1c \u0111\u1ea7u v\u00e0o c\u1ee7a n\u00f3 v\u00e0 ch\u00fang c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c ph\u00e2n lo\u1ea1i nh\u01b0 sau:<\/p>\n<ul class=\"postList\">\n<li class=\"graf graf--li graf-after--p\" id=\"26fb\">L\u1ed7 \u0111en\u200a\u2014\u200aM\u1ed9t b\u01b0\u1edbc x\u1eed l\u00fd c\u00f3 th\u1ec3 c\u00f3 c\u00e1c lu\u1ed3ng \u0111\u1ea7u v\u00e0o nh\u01b0ng kh\u00f4ng c\u00f3 lu\u1ed3ng \u0111\u1ea7u ra.<\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"9ed0\">Ph\u00e9p m\u00e0u\u200a\u2014\u200aM\u1ed9t b\u01b0\u1edbc x\u1eed l\u00fd c\u00f3 th\u1ec3 c\u00f3 c\u00e1c lu\u1ed3ng \u0111\u1ea7u ra nh\u01b0ng kh\u00f4ng c\u00f3 lu\u1ed3ng \u0111\u1ea7u v\u00e0o.<\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"5838\">L\u1ed7 x\u00e1m\u200a\u2014\u200aM\u1ed9t b\u01b0\u1edbc x\u1eed l\u00fd c\u00f3 th\u1ec3 c\u00f3 c\u00e1c \u0111\u1ea7u ra l\u1edbn h\u01a1n t\u1ed5ng c\u00e1c \u0111\u1ea7u v\u00e0o c\u1ee7a n\u00f3.<\/li>\n<\/ul>\n<figure class=\"graf graf--figure graf-after--li\" id=\"01b5\"><img class=\"graf-image\" data-height=\"468\" data-image-id=\"0*Lj0XP6QTspzza5vD.png\" data-width=\"634\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/01\/0Lj0XP6QTspzza5vD.png\"\/><\/figure>\n<h3 class=\"graf graf--h3 graf-after--figure\" id=\"c9dd\">C\u00f4ng c\u1ee5 UML mi\u1ec5n ph\u00ed<\/h3>\n<ul class=\"postList\">\n<li class=\"graf graf--li graf-after--h3\" id=\"8a80\"><a class=\"markup--anchor markup--li-anchor\" data-href=\"https:\/\/online.visual-paradigm.com\/diagrams\/features\/dfd-maker\/\" href=\"https:\/\/online.visual-paradigm.com\/diagrams\/features\/dfd-maker\/\" rel=\"noopener\" target=\"_blank\">C\u00f4ng c\u1ee5 t\u1ea1o s\u01a1 \u0111\u1ed3 lu\u1ed3ng d\u1eef li\u1ec7u tr\u1ef1c tuy\u1ebfn<\/a><\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"dc8b\"><a class=\"markup--anchor markup--li-anchor\" data-href=\"https:\/\/www.visual-paradigm.com\/tutorials\/how-to-create-data-flow-diagram\/\" href=\"https:\/\/www.visual-paradigm.com\/tutorials\/how-to-create-data-flow-diagram\/\" rel=\"noopener\" target=\"_blank\">C\u00e1ch t\u1ea1o s\u01a1 \u0111\u1ed3 lu\u1ed3ng d\u1eef li\u1ec7u (DFD)?<\/a><\/li>\n<li class=\"graf graf--li graf-after--li\" id=\"ad68\"><a class=\"markup--anchor markup--li-anchor\" data-href=\"https:\/\/www.visual-paradigm.com\/solution\/drawdfd\/\" href=\"https:\/\/www.visual-paradigm.com\/solution\/drawdfd\/\" rel=\"noopener\" target=\"_blank\">Ph\u1ea7n m\u1ec1m s\u01a1 \u0111\u1ed3 lu\u1ed3ng d\u1eef li\u1ec7u (DFD)<\/a><\/li>\n<\/ul>\n<h4 class=\"graf graf--h4 graf-after--li\" id=\"3bd4\">K\u00fd hi\u1ec7u kh\u00e1c nhau trong DFD<\/h4>\n<ul class=\"postList\">\n<li class=\"graf graf--li graf-after--h4 graf--trailing\" id=\"318f\"><a class=\"markup--anchor markup--li-anchor\" data-href=\"https:\/\/online.visual-paradigm.com\/cn\/knowledge\/software-design\/gane-sarson-dfd-tutorial\/\" href=\"https:\/\/online.visual-paradigm.com\/cn\/knowledge\/software-design\/gane-sarson-dfd-tutorial\/\" rel=\"noopener\" target=\"_blank\">H\u01b0\u1edbng d\u1eabn s\u01a1 \u0111\u1ed3 lu\u1ed3ng d\u1eef li\u1ec7u Gane-Sarson<\/a><\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/section>\n","protected":false},"excerpt":{"rendered":"<p>Although\u00a0data flow oriented modeling\u00a0is considered as an outdated technology by some software engineers, it is still one of the most widely used requirements analysis symbols. Although data flow diagrams (DFDs) are not formal parts of UML, they can be used to supplement UML diagrams and provide additional insight into system requirements and processes.<\/p>\n","protected":false},"author":1,"featured_media":1409,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"","footnotes":""},"categories":[13,5,3],"tags":[52,63,62,53],"class_list":["post-528","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-online-diagrams","category-software-engineering","category-unified-modeling-language","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 l\u00e0 g\u00ec, t\u1ea1i sao n\u00f3 v\u1eabn h\u1eefu \u00edch cho ph\u00e1t tri\u1ec3n ph\u1ea7n m\u1ec1m? - 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\/what-is-data-flow-diagram-why-it-is-still-useful-for-software-development\/\" \/>\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 l\u00e0 g\u00ec, t\u1ea1i sao n\u00f3 v\u1eabn h\u1eefu \u00edch cho ph\u00e1t tri\u1ec3n ph\u1ea7n m\u1ec1m? - Cybermedian\" \/>\n<meta property=\"og:description\" content=\"Although\u00a0data flow oriented modeling\u00a0is considered as an outdated technology by some software engineers, it is still one of the most widely used requirements analysis symbols. 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