{"id":623542,"date":"2026-11-13T10:07:34","date_gmt":"2026-11-13T03:07:34","guid":{"rendered":"https:\/\/hoanghamobile.com\/tin-tuc\/?p=623542"},"modified":"2026-11-13T10:07:34","modified_gmt":"2026-11-13T03:07:34","slug":"sequence-diagram-la-gi","status":"publish","type":"post","link":"https:\/\/hoanghamobile.com\/tin-tuc\/sequence-diagram-la-gi\/","title":{"rendered":"Sequence diagram l\u00e0 g\u00ec? Th\u00e0nh ph\u1ea7n, v\u00ed d\u1ee5 v\u00e0 c\u00e1ch v\u1ebd"},"content":{"rendered":"<p><strong>Sequence diagram (s\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1) l\u00e0 m\u1ed9t lo\u1ea1i s\u01a1 \u0111\u1ed3 t\u01b0\u01a1ng t\u00e1c trong UML, m\u00f4 t\u1ea3 c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng trong h\u1ec7 th\u1ed1ng trao \u0111\u1ed5i th\u00f4ng \u0111i\u1ec7p v\u1edbi nhau theo th\u1ee9 t\u1ef1 th\u1eddi gian t\u1eeb tr\u00ean xu\u1ed1ng d\u01b0\u1edbi.<\/strong> S\u01a1 \u0111\u1ed3 g\u1ed3m c\u00e1c \u0111\u01b0\u1eddng \u0111\u1eddi (lifeline), th\u00f4ng \u0111i\u1ec7p (message), thanh k\u00edch ho\u1ea1t (activation) v\u00e0 c\u00e1c kh\u1ed1i \u0111i\u1ec1u ki\u1ec7n, v\u00f2ng l\u1eb7p. Ch\u1ec9 c\u1ea7n n\u1eafm v\u00e0i k\u00fd hi\u1ec7u c\u01a1 b\u1ea3n v\u00e0 ch\u1ecdn m\u1ed9t k\u1ecbch b\u1ea3n c\u1ee5 th\u1ec3 nh\u01b0 \u0111\u0103ng nh\u1eadp, b\u1ea1n \u0111\u00e3 c\u00f3 th\u1ec3 t\u1ef1 v\u1ebd s\u01a1 \u0111\u1ed3 b\u1eb1ng draw.io, Mermaid ho\u1eb7c PlantUML.<\/p>\n<p><strong>T\u00f3m t\u1eaft nhanh:<\/strong><\/p>\n<ul>\n<li><strong>Sequence diagram l\u00e0 g\u00ec:<\/strong> s\u01a1 \u0111\u1ed3 UML th\u1ec3 hi\u1ec7n th\u1ee9 t\u1ef1 t\u01b0\u01a1ng t\u00e1c gi\u1eefa ng\u01b0\u1eddi d\u00f9ng v\u00e0 c\u00e1c th\u00e0nh ph\u1ea7n h\u1ec7 th\u1ed1ng theo th\u1eddi gian.<\/li>\n<li><strong>Th\u00e0nh ph\u1ea7n ch\u00ednh:<\/strong> actor, lifeline, message (\u0111\u1ed3ng b\u1ed9, b\u1ea5t \u0111\u1ed3ng b\u1ed9, ph\u1ea3n h\u1ed3i), activation, combined fragment (alt, opt, loop, par).<\/li>\n<li><strong>D\u00f9ng khi:<\/strong> ph\u00e2n t\u00edch m\u1ed9t ch\u1ee9c n\u0103ng c\u1ee5 th\u1ec3 nh\u01b0 \u0111\u0103ng nh\u1eadp, \u0111\u1eb7t h\u00e0ng, thanh to\u00e1n, g\u1ecdi API.<\/li>\n<li><strong>C\u00f4ng c\u1ee5 v\u1ebd:<\/strong> draw.io, Mermaid, PlantUML, Visual Paradigm, StarUML, sequencediagram.org.<\/li>\n<\/ul>\n<h2>Sequence diagram l\u00e0 g\u00ec?<\/h2>\n<p>Sequence diagram l\u00e0 s\u01a1 \u0111\u1ed3 th\u1ec3 hi\u1ec7n m\u1ed9t k\u1ecbch b\u1ea3n s\u1eed d\u1ee5ng c\u1ee5 th\u1ec3: ai g\u1eedi th\u00f4ng \u0111i\u1ec7p cho ai, theo th\u1ee9 t\u1ef1 n\u00e0o v\u00e0 nh\u1eadn l\u1ea1i k\u1ebft qu\u1ea3 g\u00ec. Tr\u1ee5c ngang li\u1ec7t k\u00ea c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng tham gia, tr\u1ee5c d\u1ecdc l\u00e0 th\u1eddi gian ch\u1ea1y t\u1eeb tr\u00ean xu\u1ed1ng, n\u00ean ch\u1ec9 c\u1ea7n \u0111\u1ecdc t\u1eeb tr\u00ean xu\u1ed1ng l\u00e0 hi\u1ec3u lu\u1ed3ng x\u1eed l\u00fd.<\/p>\n<p>Trong UML (Unified Modeling Language \u2013 ng\u00f4n ng\u1eef m\u00f4 h\u00ecnh h\u00f3a th\u1ed1ng nh\u1ea5t), sequence diagram thu\u1ed9c nh\u00f3m s\u01a1 \u0111\u1ed3 t\u01b0\u01a1ng t\u00e1c (interaction diagram). Ng\u01b0\u1eddi ph\u00e2n t\u00edch nghi\u1ec7p v\u1ee5, l\u1eadp tr\u00ecnh vi\u00ean backend, frontend v\u00e0 ki\u1ec3m th\u1eed \u0111\u1ec1u d\u00f9ng s\u01a1 \u0111\u1ed3 n\u00e0y \u0111\u1ec3 th\u1ed1ng nh\u1ea5t c\u00e1ch c\u00e1c th\u00e0nh ph\u1ea7n n\u00f3i chuy\u1ec7n v\u1edbi nhau. N\u1ebfu b\u1ea1n m\u1edbi l\u00e0m quen v\u1edbi c\u00e1c lo\u1ea1i s\u01a1 \u0111\u1ed3, xem tr\u01b0\u1edbc b\u00e0i <a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/diagram-la-gi\/\">diagram l\u00e0 g\u00ec<\/a> \u0111\u1ec3 c\u00f3 c\u00e1i nh\u00ecn t\u1ed5ng quan.<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter size-full wp-image-623543\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/sequence-diagram-1.jpg\" alt=\"sequence-diagram-1\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/sequence-diagram-1.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/sequence-diagram-1-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/sequence-diagram-1-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>C\u00e1c th\u00e0nh ph\u1ea7n c\u1ee7a sequence diagram<\/h2>\n<p>M\u1ed9t sequence diagram g\u1ed3m n\u0103m nh\u00f3m k\u00fd hi\u1ec7u ch\u00ednh: t\u00e1c nh\u00e2n (actor), \u0111\u01b0\u1eddng \u0111\u1eddi (lifeline), thanh k\u00edch ho\u1ea1t (activation), th\u00f4ng \u0111i\u1ec7p (message) v\u00e0 kh\u1ed1i k\u1ebft h\u1ee3p (combined fragment). N\u1eafm v\u1eefng c\u00e1c k\u00fd hi\u1ec7u n\u00e0y l\u00e0 b\u1ea1n \u0111\u1ecdc \u0111\u01b0\u1ee3c h\u1ea7u h\u1ebft s\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1 theo chu\u1ea9n UML 2.x.<\/p>\n<table>\n<thead>\n<tr>\n<th>Th\u00e0nh ph\u1ea7n<\/th>\n<th>K\u00fd hi\u1ec7u<\/th>\n<th>\u00dd ngh\u0129a<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Actor (t\u00e1c nh\u00e2n)<\/td>\n<td>H\u00ecnh ng\u01b0\u1eddi que<\/td>\n<td>Ng\u01b0\u1eddi d\u00f9ng ho\u1eb7c h\u1ec7 th\u1ed1ng b\u00ean ngo\u00e0i kh\u1edfi t\u1ea1o t\u01b0\u01a1ng t\u00e1c<\/td>\n<\/tr>\n<tr>\n<td>Lifeline (\u0111\u01b0\u1eddng \u0111\u1eddi)<\/td>\n<td>H\u1ed9p t\u00ean \u0111\u1ed1i t\u01b0\u1ee3ng + \u0111\u01b0\u1eddng n\u00e9t \u0111\u1ee9t d\u1ecdc<\/td>\n<td>\u0110\u1ed1i t\u01b0\u1ee3ng tham gia v\u00e0 s\u1ef1 t\u1ed3n t\u1ea1i c\u1ee7a n\u00f3 theo th\u1eddi gian<\/td>\n<\/tr>\n<tr>\n<td>Activation (thanh k\u00edch ho\u1ea1t)<\/td>\n<td>H\u00ecnh ch\u1eef nh\u1eadt h\u1eb9p tr\u00ean lifeline<\/td>\n<td>Kho\u1ea3ng th\u1eddi gian \u0111\u1ed1i t\u01b0\u1ee3ng \u0111ang x\u1eed l\u00fd<\/td>\n<\/tr>\n<tr>\n<td>Th\u00f4ng \u0111i\u1ec7p \u0111\u1ed3ng b\u1ed9<\/td>\n<td>M\u0169i t\u00ean n\u00e9t li\u1ec1n, \u0111\u1ea7u t\u00f4 \u0111\u1eb7c<\/td>\n<td>B\u00ean g\u1eedi ch\u1edd k\u1ebft qu\u1ea3 r\u1ed3i m\u1edbi l\u00e0m ti\u1ebfp<\/td>\n<\/tr>\n<tr>\n<td>Th\u00f4ng \u0111i\u1ec7p b\u1ea5t \u0111\u1ed3ng b\u1ed9<\/td>\n<td>M\u0169i t\u00ean n\u00e9t li\u1ec1n, \u0111\u1ea7u m\u1edf<\/td>\n<td>B\u00ean g\u1eedi kh\u00f4ng ch\u1edd ph\u1ea3n h\u1ed3i<\/td>\n<\/tr>\n<tr>\n<td>Th\u00f4ng \u0111i\u1ec7p ph\u1ea3n h\u1ed3i<\/td>\n<td>M\u0169i t\u00ean n\u00e9t \u0111\u1ee9t<\/td>\n<td>K\u1ebft qu\u1ea3 tr\u1ea3 v\u1ec1 cho b\u00ean g\u1ecdi<\/td>\n<\/tr>\n<tr>\n<td>H\u1ee7y \u0111\u1ed1i t\u01b0\u1ee3ng<\/td>\n<td>D\u1ea5u X \u1edf cu\u1ed1i lifeline<\/td>\n<td>\u0110\u1ed1i t\u01b0\u1ee3ng k\u1ebft th\u00fac v\u00f2ng \u0111\u1eddi<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>C\u00e1c kh\u1ed1i \u0111i\u1ec1u ki\u1ec7n, v\u00f2ng l\u1eb7p trong sequence diagram<\/h2>\n<p>Kh\u1ed1i k\u1ebft h\u1ee3p (combined fragment) l\u00e0 khung ch\u1eef nh\u1eadt c\u00f3 nh\u00e3n \u1edf g\u00f3c tr\u00ean b\u00ean tr\u00e1i, d\u00f9ng \u0111\u1ec3 th\u1ec3 hi\u1ec7n r\u1ebd nh\u00e1nh, t\u00f9y ch\u1ecdn, v\u00f2ng l\u1eb7p hay x\u1eed l\u00fd song song trong sequence diagram. Kh\u00e1i ni\u1ec7m n\u00e0y \u0111\u01b0\u1ee3c \u0111\u01b0a v\u00e0o t\u1eeb UML 2.0; m\u1ed7i kh\u1ed1i c\u00f3 m\u1ed9t to\u00e1n t\u1eed (operator) v\u00e0 c\u00f3 th\u1ec3 chia th\u00e0nh nhi\u1ec1u v\u00f9ng k\u00e8m \u0111i\u1ec1u ki\u1ec7n canh (guard) \u0111\u1eb7t trong ngo\u1eb7c vu\u00f4ng, v\u00ed d\u1ee5 [m\u1eadt kh\u1ea9u \u0111\u00fang].<\/p>\n<ul>\n<li><strong>alt:<\/strong> r\u1ebd nh\u00e1nh theo \u0111i\u1ec1u ki\u1ec7n, gi\u1ed1ng if \u2013 else (v\u00ed d\u1ee5 \u0111\u0103ng nh\u1eadp \u0111\u00fang \/ sai).<\/li>\n<li><strong>opt:<\/strong> \u0111o\u1ea1n ch\u1ec9 ch\u1ea1y khi \u0111i\u1ec1u ki\u1ec7n \u0111\u00fang, gi\u1ed1ng if kh\u00f4ng c\u00f3 else.<\/li>\n<li><strong>loop:<\/strong> l\u1eb7p l\u1ea1i nhi\u1ec1u l\u1ea7n (v\u00ed d\u1ee5 th\u1eed l\u1ea1i t\u1ed1i \u0111a 3 l\u1ea7n).<\/li>\n<li><strong>par:<\/strong> c\u00e1c \u0111o\u1ea1n ch\u1ea1y song song.<\/li>\n<li><strong>break:<\/strong> tho\u00e1t kh\u1ecfi lu\u1ed3ng ch\u00ednh khi g\u1eb7p \u0111i\u1ec1u ki\u1ec7n.<\/li>\n<li><strong>ref:<\/strong> tham chi\u1ebfu t\u1edbi m\u1ed9t sequence diagram kh\u00e1c \u0111\u1ec3 s\u01a1 \u0111\u1ed3 g\u1ecdn h\u01a1n.<\/li>\n<\/ul>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-623544\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/sequence-diagram-2.jpg\" alt=\"sequence-diagram-2\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/sequence-diagram-2.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/sequence-diagram-2-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/sequence-diagram-2-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>V\u00ed d\u1ee5 sequence diagram ch\u1ee9c n\u0103ng \u0111\u0103ng nh\u1eadp<\/h2>\n<p>Ch\u1ee9c n\u0103ng \u0111\u0103ng nh\u1eadp l\u00e0 v\u00ed d\u1ee5 kinh \u0111i\u1ec3n: ng\u01b0\u1eddi d\u00f9ng nh\u1eadp t\u00e0i kho\u1ea3n, giao di\u1ec7n g\u1eedi y\u00eau c\u1ea7u t\u1edbi m\u00e1y ch\u1ee7, m\u00e1y ch\u1ee7 ki\u1ec3m tra trong c\u01a1 s\u1edf d\u1eef li\u1ec7u r\u1ed3i tr\u1ea3 k\u1ebft qu\u1ea3 th\u00e0nh c\u00f4ng ho\u1eb7c b\u00e1o l\u1ed7i.<\/p>\n<ol>\n<li>Ng\u01b0\u1eddi d\u00f9ng nh\u1eadp email, m\u1eadt kh\u1ea9u v\u00e0 b\u1ea5m \u0110\u0103ng nh\u1eadp tr\u00ean giao di\u1ec7n.<\/li>\n<li>Giao di\u1ec7n g\u1eedi y\u00eau c\u1ea7u \u0111\u0103ng nh\u1eadp (th\u00f4ng \u0111i\u1ec7p \u0111\u1ed3ng b\u1ed9) t\u1edbi m\u00e1y ch\u1ee7 qua API.<\/li>\n<li>M\u00e1y ch\u1ee7 truy v\u1ea5n c\u01a1 s\u1edf d\u1eef li\u1ec7u \u0111\u1ec3 l\u1ea5y th\u00f4ng tin t\u00e0i kho\u1ea3n.<\/li>\n<li>C\u01a1 s\u1edf d\u1eef li\u1ec7u tr\u1ea3 v\u1ec1 d\u1eef li\u1ec7u ng\u01b0\u1eddi d\u00f9ng (th\u00f4ng \u0111i\u1ec7p ph\u1ea3n h\u1ed3i).<\/li>\n<li>Kh\u1ed1i <strong>alt<\/strong>: n\u1ebfu m\u1eadt kh\u1ea9u \u0111\u00fang, m\u00e1y ch\u1ee7 t\u1ea1o phi\u00ean \u0111\u0103ng nh\u1eadp v\u00e0 tr\u1ea3 v\u1ec1 th\u00e0nh c\u00f4ng; n\u1ebfu sai, tr\u1ea3 v\u1ec1 th\u00f4ng b\u00e1o l\u1ed7i.<\/li>\n<li>Giao di\u1ec7n hi\u1ec3n th\u1ecb trang ch\u1ee7 ho\u1eb7c th\u00f4ng b\u00e1o l\u1ed7i cho ng\u01b0\u1eddi d\u00f9ng.<\/li>\n<\/ol>\n<p>Vi\u1ebft b\u1eb1ng Mermaid, s\u01a1 \u0111\u1ed3 tr\u00ean c\u00f3 d\u1ea1ng:<\/p>\n<pre><code>sequenceDiagram\n    actor U as Ng\u01b0\u1eddi d\u00f9ng\n    participant G as Giao di\u1ec7n\n    participant S as M\u00e1y ch\u1ee7\n    participant D as CSDL\n    U-&gt;&gt;G: Nh\u1eadp email, m\u1eadt kh\u1ea9u\n    G-&gt;&gt;S: POST \/login\n    S-&gt;&gt;D: T\u00ecm t\u00e0i kho\u1ea3n\n    D--&gt;&gt;S: Th\u00f4ng tin t\u00e0i kho\u1ea3n\n    alt M\u1eadt kh\u1ea9u \u0111\u00fang\n        S--&gt;&gt;G: \u0110\u0103ng nh\u1eadp th\u00e0nh c\u00f4ng\n        G--&gt;&gt;U: M\u1edf trang ch\u1ee7\n    else M\u1eadt kh\u1ea9u sai\n        S--&gt;&gt;G: L\u1ed7i x\u00e1c th\u1ef1c\n        G--&gt;&gt;U: B\u00e1o sai m\u1eadt kh\u1ea9u\n    end<\/code><\/pre>\n<p>\u0110\u1ec3 hi\u1ec3u r\u00f5 h\u01a1n ph\u1ea7n giao di\u1ec7n g\u1ecdi m\u00e1y ch\u1ee7, xem b\u00e0i <a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/api-la-gi\/\">API l\u00e0 g\u00ec<\/a> v\u00e0 <a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/backend-la-gi\/\">backend l\u00e0 g\u00ec<\/a>.<\/p>\n<h2>C\u00e1ch v\u1ebd sequence diagram t\u1eebng b\u01b0\u1edbc<\/h2>\n<p>\u0110\u1ec3 v\u1ebd sequence diagram, b\u1ea1n ch\u1ecdn m\u1ed9t k\u1ecbch b\u1ea3n c\u1ee5 th\u1ec3, li\u1ec7t k\u00ea c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng tham gia, s\u1eafp x\u1ebfp th\u00f4ng \u0111i\u1ec7p theo th\u1ee9 t\u1ef1 th\u1eddi gian, r\u1ed3i b\u1ed5 sung ph\u1ea3n h\u1ed3i v\u00e0 c\u00e1c kh\u1ed1i \u0111i\u1ec1u ki\u1ec7n, v\u00f2ng l\u1eb7p.<\/p>\n<ol>\n<li><strong>Ch\u1ecdn m\u1ed9t k\u1ecbch b\u1ea3n:<\/strong> m\u1ed7i s\u01a1 \u0111\u1ed3 ch\u1ec9 n\u00ean m\u00f4 t\u1ea3 m\u1ed9t ch\u1ee9c n\u0103ng, v\u00ed d\u1ee5 &#8220;\u0111\u1eb7t h\u00e0ng th\u00e0nh c\u00f4ng&#8221;.<\/li>\n<li><strong>X\u00e1c \u0111\u1ecbnh \u0111\u1ed1i t\u01b0\u1ee3ng:<\/strong> actor kh\u1edfi t\u1ea1o v\u00e0 c\u00e1c th\u00e0nh ph\u1ea7n nh\u01b0 giao di\u1ec7n, m\u00e1y ch\u1ee7, d\u1ecbch v\u1ee5 thanh to\u00e1n, c\u01a1 s\u1edf d\u1eef li\u1ec7u.<\/li>\n<li><strong>\u0110\u1eb7t lifeline t\u1eeb tr\u00e1i sang ph\u1ea3i<\/strong> theo th\u1ee9 t\u1ef1 tham gia, actor \u1edf ngo\u00e0i c\u00f9ng b\u00ean tr\u00e1i.<\/li>\n<li><strong>V\u1ebd th\u00f4ng \u0111i\u1ec7p theo th\u1eddi gian<\/strong> t\u1eeb tr\u00ean xu\u1ed1ng, \u0111\u1eb7t t\u00ean r\u00f5 r\u00e0ng d\u1ea1ng \u0111\u1ed9ng t\u1eeb (T\u1ea1o \u0111\u01a1n, Ki\u1ec3m tra t\u1ed3n kho).<\/li>\n<li><strong>Th\u00eam th\u00f4ng \u0111i\u1ec7p ph\u1ea3n h\u1ed3i<\/strong> b\u1eb1ng n\u00e9t \u0111\u1ee9t khi c\u1ea7n th\u1ec3 hi\u1ec7n k\u1ebft qu\u1ea3 tr\u1ea3 v\u1ec1.<\/li>\n<li><strong>Th\u00eam alt, opt, loop<\/strong> cho c\u00e1c nh\u00e1nh l\u1ed7i, t\u00f9y ch\u1ecdn, th\u1eed l\u1ea1i.<\/li>\n<li><strong>R\u00e0 l\u1ea1i v\u1edbi nh\u00f3m<\/strong> \u0111\u1ec3 ch\u1eafc s\u01a1 \u0111\u1ed3 kh\u1edbp v\u1edbi y\u00eau c\u1ea7u v\u00e0 thi\u1ebft k\u1ebf API.<\/li>\n<\/ol>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-623545\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/sequence-diagram-3.jpg\" alt=\"sequence-diagram-3\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/sequence-diagram-3.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/sequence-diagram-3-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/sequence-diagram-3-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>C\u00f4ng c\u1ee5 v\u1ebd sequence diagram mi\u1ec5n ph\u00ed<\/h2>\n<p>B\u1ea1n c\u00f3 th\u1ec3 v\u1ebd sequence diagram b\u1eb1ng c\u00f4ng c\u1ee5 k\u00e9o th\u1ea3 nh\u01b0 draw.io, ho\u1eb7c vi\u1ebft m\u00e3 v\u0103n b\u1ea3n \u0111\u1ec3 t\u1ef1 sinh s\u01a1 \u0111\u1ed3 b\u1eb1ng Mermaid, PlantUML; c\u00e1ch vi\u1ebft m\u00e3 gi\u00fap d\u1ec5 s\u1eeda v\u00e0 l\u01b0u c\u00f9ng m\u00e3 ngu\u1ed3n d\u1ef1 \u00e1n.<\/p>\n<table>\n<thead>\n<tr>\n<th>C\u00f4ng c\u1ee5<\/th>\n<th>C\u00e1ch d\u00f9ng<\/th>\n<th>Ph\u00f9 h\u1ee3p<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>draw.io (diagrams.net)<\/td>\n<td>K\u00e9o th\u1ea3, c\u00f3 s\u1eb5n b\u1ed9 k\u00fd hi\u1ec7u UML<\/td>\n<td>Ng\u01b0\u1eddi m\u1edbi, c\u1ea7n ch\u1ec9nh giao di\u1ec7n s\u01a1 \u0111\u1ed3 t\u1ef1 do<\/td>\n<\/tr>\n<tr>\n<td>Mermaid<\/td>\n<td>Vi\u1ebft m\u00e3 v\u0103n b\u1ea3n, hi\u1ec3n th\u1ecb trong nhi\u1ec1u c\u00f4ng c\u1ee5 t\u00e0i li\u1ec7u, GitHub<\/td>\n<td>L\u1eadp tr\u00ecnh vi\u00ean, vi\u1ebft t\u00e0i li\u1ec7u k\u1ef9 thu\u1eadt<\/td>\n<\/tr>\n<tr>\n<td>PlantUML<\/td>\n<td>Vi\u1ebft m\u00e3 v\u0103n b\u1ea3n, h\u1ed7 tr\u1ee3 \u0111\u1ea7y \u0111\u1ee7 k\u00fd hi\u1ec7u UML<\/td>\n<td>D\u1ef1 \u00e1n c\u1ea7n s\u01a1 \u0111\u1ed3 UML chi ti\u1ebft<\/td>\n<\/tr>\n<tr>\n<td>sequencediagram.org<\/td>\n<td>Vi\u1ebft m\u00e3 tr\u1ef1c ti\u1ebfp tr\u00ean web, xem ngay<\/td>\n<td>V\u1ebd nhanh, kh\u00f4ng c\u1ea7n c\u00e0i \u0111\u1eb7t<\/td>\n<\/tr>\n<tr>\n<td>Lucidchart<\/td>\n<td>K\u00e9o th\u1ea3 tr\u00ean tr\u00ecnh duy\u1ec7t, c\u00f3 th\u01b0 vi\u1ec7n k\u00fd hi\u1ec7u UML<\/td>\n<td>L\u00e0m vi\u1ec7c nh\u00f3m online; b\u1ea3n mi\u1ec5n ph\u00ed c\u00f3 gi\u1edbi h\u1ea1n<\/td>\n<\/tr>\n<tr>\n<td>Visual Paradigm, StarUML<\/td>\n<td>Ph\u1ea7n m\u1ec1m m\u00f4 h\u00ecnh h\u00f3a UML \u0111\u1ea7y \u0111\u1ee7<\/td>\n<td>Ph\u00e2n t\u00edch thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng l\u1edbn<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>V\u1edbi PlantUML, c\u00f9ng k\u1ecbch b\u1ea3n \u0111\u0103ng nh\u1eadp \u0111\u01b0\u1ee3c vi\u1ebft nh\u01b0 sau; m\u0169i t\u00ean <code>-&gt;<\/code> l\u00e0 th\u00f4ng \u0111i\u1ec7p \u0111\u1ed3ng b\u1ed9, <code>--&gt;<\/code> l\u00e0 ph\u1ea3n h\u1ed3i n\u00e9t \u0111\u1ee9t, c\u00f2n <code>activate<\/code>\/<code>deactivate<\/code> v\u1ebd thanh k\u00edch ho\u1ea1t:<\/p>\n<pre><code>@startuml\nactor \"Ng\u01b0\u1eddi d\u00f9ng\" as U\nparticipant \"Giao di\u1ec7n\" as G\nparticipant \"M\u00e1y ch\u1ee7\" as S\ndatabase \"CSDL\" as D\nU -&gt; G : Nh\u1eadp email, m\u1eadt kh\u1ea9u\nactivate G\nG -&gt; S : POST \/login\nactivate S\nS -&gt; D : T\u00ecm t\u00e0i kho\u1ea3n\nD --&gt; S : Th\u00f4ng tin t\u00e0i kho\u1ea3n\nalt M\u1eadt kh\u1ea9u \u0111\u00fang\n  S --&gt; G : \u0110\u0103ng nh\u1eadp th\u00e0nh c\u00f4ng\nelse M\u1eadt kh\u1ea9u sai\n  S --&gt; G : L\u1ed7i x\u00e1c th\u1ef1c\nend\ndeactivate S\nG --&gt; U : Hi\u1ec3n th\u1ecb k\u1ebft qu\u1ea3\ndeactivate G\n@enduml<\/code><\/pre>\n<h2>Sequence diagram kh\u00e1c activity diagram v\u00e0 class diagram th\u1ebf n\u00e0o?<\/h2>\n<p>Sequence diagram t\u1eadp trung v\u00e0o th\u1ee9 t\u1ef1 th\u00f4ng \u0111i\u1ec7p gi\u1eefa c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng, activity diagram t\u1eadp trung v\u00e0o lu\u1ed3ng c\u00f4ng vi\u1ec7c v\u00e0 quy\u1ebft \u0111\u1ecbnh, c\u00f2n class diagram m\u00f4 t\u1ea3 c\u1ea5u tr\u00fac t\u0129nh g\u1ed3m l\u1edbp, thu\u1ed9c t\u00ednh v\u00e0 quan h\u1ec7.<\/p>\n<table>\n<thead>\n<tr>\n<th>S\u01a1 \u0111\u1ed3<\/th>\n<th>Tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi<\/th>\n<th>Lo\u1ea1i<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Sequence diagram<\/td>\n<td>C\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng n\u00f3i chuy\u1ec7n v\u1edbi nhau theo th\u1ee9 t\u1ef1 n\u00e0o?<\/td>\n<td>H\u00e0nh vi, t\u01b0\u01a1ng t\u00e1c<\/td>\n<\/tr>\n<tr>\n<td>Activity diagram<\/td>\n<td>C\u00f4ng vi\u1ec7c di\u1ec5n ra qua nh\u1eefng b\u01b0\u1edbc, nh\u00e1nh n\u00e0o?<\/td>\n<td>H\u00e0nh vi, lu\u1ed3ng x\u1eed l\u00fd<\/td>\n<\/tr>\n<tr>\n<td>Use case diagram<\/td>\n<td>Ai d\u00f9ng h\u1ec7 th\u1ed1ng \u0111\u1ec3 l\u00e0m g\u00ec?<\/td>\n<td>H\u00e0nh vi, ch\u1ee9c n\u0103ng<\/td>\n<\/tr>\n<tr>\n<td>Class diagram<\/td>\n<td>H\u1ec7 th\u1ed1ng g\u1ed3m nh\u1eefng l\u1edbp, quan h\u1ec7 n\u00e0o?<\/td>\n<td>C\u1ea5u tr\u00fac t\u0129nh<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Khi thi\u1ebft k\u1ebf ph\u1ea7n l\u01b0u tr\u1eef d\u1eef li\u1ec7u \u0111i k\u00e8m, b\u1ea1n c\u00f3 th\u1ec3 tham kh\u1ea3o th\u00eam b\u00e0i <a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/database-la-gi\/\">database l\u00e0 g\u00ec<\/a>.<\/p>\n<h2>L\u1ed7i th\u01b0\u1eddng g\u1eb7p khi v\u1ebd sequence diagram<\/h2>\n<p>L\u1ed7i hay g\u1eb7p nh\u1ea5t l\u00e0 nh\u1ed3i qu\u00e1 nhi\u1ec1u k\u1ecbch b\u1ea3n v\u00e0o m\u1ed9t s\u01a1 \u0111\u1ed3, d\u00f9ng sai ki\u1ec3u m\u0169i t\u00ean, \u0111\u1eb7t t\u00ean th\u00f4ng \u0111i\u1ec7p m\u01a1 h\u1ed3 v\u00e0 qu\u00ean nh\u00e1nh l\u1ed7i.<\/p>\n<ul>\n<li><strong>M\u1ed9t s\u01a1 \u0111\u1ed3 qu\u00e1 nhi\u1ec1u lu\u1ed3ng:<\/strong> t\u00e1ch ra nhi\u1ec1u s\u01a1 \u0111\u1ed3 ho\u1eb7c d\u00f9ng kh\u1ed1i ref.<\/li>\n<li><strong>Nh\u1ea7m m\u0169i t\u00ean:<\/strong> ph\u1ea3n h\u1ed3i ph\u1ea3i n\u00e9t \u0111\u1ee9t; \u0111\u1ed3ng b\u1ed9 d\u00f9ng \u0111\u1ea7u t\u00f4 \u0111\u1eb7c.<\/li>\n<li><strong>T\u00ean th\u00f4ng \u0111i\u1ec7p chung chung:<\/strong> &#8220;G\u1eedi d\u1eef li\u1ec7u&#8221; n\u00ean \u0111\u1ed5i th\u00e0nh &#8220;G\u1eedi th\u00f4ng tin \u0111\u01a1n h\u00e0ng&#8221;.<\/li>\n<li><strong>Thi\u1ebfu nh\u00e1nh l\u1ed7i:<\/strong> lu\u00f4n c\u00e2n nh\u1eafc tr\u01b0\u1eddng h\u1ee3p h\u1ebft h\u00e0ng, m\u1ea5t k\u1ebft n\u1ed1i, sai m\u1eadt kh\u1ea9u.<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-623546\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/sequence-diagram-4.jpg\" alt=\"sequence-diagram-4\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/sequence-diagram-4.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/sequence-diagram-4-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/sequence-diagram-4-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p v\u1ec1 sequence diagram<\/h2>\n<h3>Sequence diagram l\u00e0 g\u00ec?<\/h3>\n<p>Sequence diagram l\u00e0 s\u01a1 \u0111\u1ed3 t\u01b0\u01a1ng t\u00e1c trong UML, m\u00f4 t\u1ea3 c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng trao \u0111\u1ed5i th\u00f4ng \u0111i\u1ec7p v\u1edbi nhau theo th\u1ee9 t\u1ef1 th\u1eddi gian \u0111\u1ec3 th\u1ef1c hi\u1ec7n m\u1ed9t ch\u1ee9c n\u0103ng.<\/p>\n<h3>Sequence diagram ti\u1ebfng Vi\u1ec7t g\u1ecdi l\u00e0 g\u00ec?<\/h3>\n<p>Th\u01b0\u1eddng g\u1ecdi l\u00e0 s\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1 ho\u1eb7c bi\u1ec3u \u0111\u1ed3 tu\u1ea7n t\u1ef1.<\/p>\n<h3>Lifeline trong sequence diagram l\u00e0 g\u00ec?<\/h3>\n<p>Lifeline l\u00e0 \u0111\u01b0\u1eddng n\u00e9t \u0111\u1ee9t d\u1ecdc d\u01b0\u1edbi m\u1ed7i \u0111\u1ed1i t\u01b0\u1ee3ng, th\u1ec3 hi\u1ec7n s\u1ef1 t\u1ed3n t\u1ea1i c\u1ee7a \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u00f3 trong su\u1ed1t k\u1ecbch b\u1ea3n t\u01b0\u01a1ng t\u00e1c.<\/p>\n<h3>M\u0169i t\u00ean n\u00e9t li\u1ec1n v\u00e0 n\u00e9t \u0111\u1ee9t kh\u00e1c nhau th\u1ebf n\u00e0o?<\/h3>\n<p>M\u0169i t\u00ean n\u00e9t li\u1ec1n l\u00e0 th\u00f4ng \u0111i\u1ec7p g\u1eedi \u0111i (g\u1ecdi h\u00e0m, y\u00eau c\u1ea7u); m\u0169i t\u00ean n\u00e9t \u0111\u1ee9t l\u00e0 th\u00f4ng \u0111i\u1ec7p ph\u1ea3n h\u1ed3i, k\u1ebft qu\u1ea3 tr\u1ea3 v\u1ec1.<\/p>\n<h3>V\u1ebd sequence diagram b\u1eb1ng c\u00f4ng c\u1ee5 n\u00e0o?<\/h3>\n<p>C\u00f3 th\u1ec3 d\u00f9ng draw.io \u0111\u1ec3 k\u00e9o th\u1ea3, Mermaid ho\u1eb7c PlantUML \u0111\u1ec3 vi\u1ebft m\u00e3 sinh s\u01a1 \u0111\u1ed3, ho\u1eb7c ph\u1ea7n m\u1ec1m UML nh\u01b0 Visual Paradigm, StarUML.<\/p>\n<h3>Khi n\u00e0o n\u00ean d\u00f9ng sequence diagram?<\/h3>\n<p>Khi c\u1ea7n l\u00e0m r\u00f5 c\u00e1ch c\u00e1c th\u00e0nh ph\u1ea7n ph\u1ed1i h\u1ee3p trong m\u1ed9t ch\u1ee9c n\u0103ng c\u1ee5 th\u1ec3 nh\u01b0 \u0111\u0103ng nh\u1eadp, thanh to\u00e1n, g\u1ecdi API, tr\u01b0\u1edbc khi l\u1eadp tr\u00ecnh ho\u1eb7c khi vi\u1ebft t\u00e0i li\u1ec7u h\u1ec7 th\u1ed1ng.<\/p>\n<h2>K\u1ebft lu\u1eadn<\/h2>\n<p>Sequence diagram gi\u00fap nh\u00ecn r\u00f5 c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng trong h\u1ec7 th\u1ed1ng trao \u0111\u1ed5i th\u00f4ng \u0111i\u1ec7p theo th\u1ee9 t\u1ef1 th\u1eddi gian, l\u00e0 c\u00f4ng c\u1ee5 quen thu\u1ed9c khi ph\u00e2n t\u00edch v\u00e0 thi\u1ebft k\u1ebf ph\u1ea7n m\u1ec1m. H\u00e3y n\u1eafm c\u00e1c k\u00fd hi\u1ec7u lifeline, activation, th\u00f4ng \u0111i\u1ec7p \u0111\u1ed3ng b\u1ed9, ph\u1ea3n h\u1ed3i v\u00e0 kh\u1ed1i alt, opt, loop, b\u1eaft \u0111\u1ea7u t\u1eeb m\u1ed9t k\u1ecbch b\u1ea3n c\u1ee5 th\u1ec3 nh\u01b0 \u0111\u0103ng nh\u1eadp, r\u1ed3i ch\u1ecdn draw.io ho\u1eb7c Mermaid, PlantUML \u0111\u1ec3 v\u1ebd nhanh v\u00e0 d\u1ec5 ch\u1ec9nh s\u1eeda.<\/p>\n<p>Xem th\u00eam:<br \/>\n<a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/diagram-la-gi\/\">Diagram l\u00e0 g\u00ec? C\u00e1c lo\u1ea1i diagram v\u00e0 c\u00e1ch v\u1ebd tr\u1ef1c quan 2026<\/a><\/p>\n<p><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/mindmap-ai\/\">Mindmap AI: C\u00f4ng c\u1ee5 h\u1ed7 tr\u1ee3 s\u1eafp x\u1ebfp \u00fd t\u01b0\u1edfng v\u00e0 h\u1ecdc t\u1eadp hi\u1ec7u qu\u1ea3<\/a><\/p>\n<p><script type=\"application\/ld+json\">{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Sequence diagram l\u00e0 g\u00ec?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Sequence diagram l\u00e0 s\u01a1 \u0111\u1ed3 t\u01b0\u01a1ng t\u00e1c trong UML, m\u00f4 t\u1ea3 c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng trao \u0111\u1ed5i th\u00f4ng \u0111i\u1ec7p v\u1edbi nhau theo th\u1ee9 t\u1ef1 th\u1eddi gian \u0111\u1ec3 th\u1ef1c hi\u1ec7n m\u1ed9t ch\u1ee9c n\u0103ng.\"}}, {\"@type\": \"Question\", \"name\": \"Sequence diagram ti\u1ebfng Vi\u1ec7t g\u1ecdi l\u00e0 g\u00ec?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Th\u01b0\u1eddng g\u1ecdi l\u00e0 s\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1 ho\u1eb7c bi\u1ec3u \u0111\u1ed3 tu\u1ea7n t\u1ef1.\"}}, {\"@type\": \"Question\", \"name\": \"Lifeline trong sequence diagram l\u00e0 g\u00ec?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Lifeline l\u00e0 \u0111\u01b0\u1eddng n\u00e9t \u0111\u1ee9t d\u1ecdc d\u01b0\u1edbi m\u1ed7i \u0111\u1ed1i t\u01b0\u1ee3ng, th\u1ec3 hi\u1ec7n s\u1ef1 t\u1ed3n t\u1ea1i c\u1ee7a \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u00f3 trong su\u1ed1t k\u1ecbch b\u1ea3n t\u01b0\u01a1ng t\u00e1c.\"}}, {\"@type\": \"Question\", \"name\": \"M\u0169i t\u00ean n\u00e9t li\u1ec1n v\u00e0 n\u00e9t \u0111\u1ee9t kh\u00e1c nhau th\u1ebf n\u00e0o?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"M\u0169i t\u00ean n\u00e9t li\u1ec1n l\u00e0 th\u00f4ng \u0111i\u1ec7p g\u1eedi \u0111i (g\u1ecdi h\u00e0m, y\u00eau c\u1ea7u); m\u0169i t\u00ean n\u00e9t \u0111\u1ee9t l\u00e0 th\u00f4ng \u0111i\u1ec7p ph\u1ea3n h\u1ed3i, k\u1ebft qu\u1ea3 tr\u1ea3 v\u1ec1.\"}}, {\"@type\": \"Question\", \"name\": \"V\u1ebd sequence diagram b\u1eb1ng c\u00f4ng c\u1ee5 n\u00e0o?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"C\u00f3 th\u1ec3 d\u00f9ng draw.io \u0111\u1ec3 k\u00e9o th\u1ea3, Mermaid ho\u1eb7c PlantUML \u0111\u1ec3 vi\u1ebft m\u00e3 sinh s\u01a1 \u0111\u1ed3, ho\u1eb7c ph\u1ea7n m\u1ec1m UML nh\u01b0 Visual Paradigm, StarUML.\"}}, {\"@type\": \"Question\", \"name\": \"Khi n\u00e0o n\u00ean d\u00f9ng sequence diagram?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Khi c\u1ea7n l\u00e0m r\u00f5 c\u00e1ch c\u00e1c th\u00e0nh ph\u1ea7n ph\u1ed1i h\u1ee3p trong m\u1ed9t ch\u1ee9c n\u0103ng c\u1ee5 th\u1ec3 nh\u01b0 \u0111\u0103ng nh\u1eadp, thanh to\u00e1n, g\u1ecdi API, tr\u01b0\u1edbc khi l\u1eadp tr\u00ecnh ho\u1eb7c khi vi\u1ebft t\u00e0i li\u1ec7u h\u1ec7 th\u1ed1ng.\"}}]}<\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Sequence diagram (s\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1) l\u00e0 m\u1ed9t lo\u1ea1i s\u01a1 \u0111\u1ed3 t\u01b0\u01a1ng t\u00e1c trong UML, m\u00f4 t\u1ea3 c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng trong h\u1ec7 th\u1ed1ng trao \u0111\u1ed5i th\u00f4ng \u0111i\u1ec7p v\u1edbi nhau theo th\u1ee9 t\u1ef1 th\u1eddi gian t\u1eeb tr\u00ean xu\u1ed1ng d\u01b0\u1edbi. S\u01a1 \u0111\u1ed3 g\u1ed3m c\u00e1c \u0111\u01b0\u1eddng \u0111\u1eddi (lifeline), th\u00f4ng \u0111i\u1ec7p (message), thanh k\u00edch ho\u1ea1t (activation) v\u00e0 c\u00e1c kh\u1ed1i [&hellip;]<\/p>\n","protected":false},"author":102,"featured_media":623547,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"sequence diagram l\u00e0 g\u00ec","_yoast_wpseo_title":"Sequence diagram l\u00e0 g\u00ec? Th\u00e0nh ph\u1ea7n, v\u00ed d\u1ee5 v\u00e0 c\u00e1ch v\u1ebd","_yoast_wpseo_metadesc":"Sequence diagram l\u00e0 g\u00ec? Hi\u1ec3u lifeline, message, activation, kh\u1ed1i alt\/opt\/loop, v\u00ed d\u1ee5 \u0111\u0103ng nh\u1eadp v\u00e0 c\u00f4ng c\u1ee5 v\u1ebd. Xem chi ti\u1ebft t\u1ea1i Ho\u00e0ng H\u00e0 Mobile.","footnotes":""},"categories":[29235,3910],"tags":[],"class_list":["post-623542","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-goc-to-mo","category-kham-pha"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Sequence diagram l\u00e0 g\u00ec? Th\u00e0nh ph\u1ea7n, v\u00ed d\u1ee5 v\u00e0 c\u00e1ch v\u1ebd<\/title>\n<meta name=\"description\" content=\"Sequence diagram l\u00e0 g\u00ec? Hi\u1ec3u lifeline, message, activation, kh\u1ed1i alt\/opt\/loop, v\u00ed d\u1ee5 \u0111\u0103ng nh\u1eadp v\u00e0 c\u00f4ng c\u1ee5 v\u1ebd. 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