{"id":10672,"date":"2025-12-03T15:01:27","date_gmt":"2025-12-03T07:01:27","guid":{"rendered":"https:\/\/www.cybermedian.com\/fr\/uml-activity-diagram-modeling-sequential-and-concurrent-system-flow\/"},"modified":"2026-04-14T10:57:25","modified_gmt":"2026-04-14T10:57:25","slug":"uml-activity-diagram-modeling-sequential-and-concurrent-system-flow","status":"publish","type":"post","link":"https:\/\/www.cybermedian.com\/fr\/uml-activity-diagram-modeling-sequential-and-concurrent-system-flow\/","title":{"rendered":"Diagramme d&#8217;activit\u00e9 UML : Mod\u00e9lisation du flux s\u00e9quentiel et concurrent d&#8217;un syst\u00e8me"},"content":{"rendered":"<p>Le <a href=\"https:\/\/chat.visual-paradigm.com\/diagram\/uml-activity-diagram\/\">Diagramme d&#8217;activit\u00e9 UML<\/a>est fondamentalement un organigramme qui mod\u00e9lise les \u00e9tapes s\u00e9quentielles et concurrentes, ou activit\u00e9s, d&#8217;un processus. Il est utilis\u00e9 pour d\u00e9crire les aspects dynamiques d&#8217;un syst\u00e8me, en mettant l&#8217;accent sur le flux de contr\u00f4le d&#8217;une activit\u00e9 \u00e0 la suivante.<\/p>\n<p>Ce diagramme est pr\u00e9cieux pour mod\u00e9liser les processus m\u00e9tier, d\u00e9finir les flux de travail \u00e0 travers diff\u00e9rents composants, et documenter la logique interne d&#8217;un syst\u00e8me ou d&#8217;une m\u00e9thode.<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/online.visual-paradigm.com\/repository\/images\/0906ba8d-8066-4ef9-9059-d353c21f6c2c\/activity-diagram-design\/uml-activity-diagram-example-article-submission.png\"\/><\/p>\n<h2>\u00c9l\u00e9ments fondamentaux du flux d&#8217;activit\u00e9<\/h2>\n<p>Un diagramme d&#8217;activit\u00e9 est construit \u00e0 partir de n\u0153uds (repr\u00e9sentant les \u00e9tapes) et d&#8217;arcs (repr\u00e9sentant le flux de contr\u00f4le).<\/p>\n<h3>A. N\u0153uds d&#8217;activit\u00e9 et d&#8217;action<\/h3>\n<p>Ils repr\u00e9sentent une \u00e9tape ou une t\u00e2che unique effectu\u00e9e dans le processus.<\/p>\n<p><img alt=\"\" class=\"alignnone size-full wp-image-14474\" decoding=\"async\" height=\"289\" loading=\"lazy\" sizes=\"auto, (max-width: 432px) 100vw, 432px\" src=\"https:\/\/www.cybermedian.com\/wp-content\/uploads\/2025\/12\/activity-diagram-Activity-and-Action-Nodes.png\" srcset=\"https:\/\/www.cybermedian.com\/wp-content\/uploads\/2025\/12\/activity-diagram-Activity-and-Action-Nodes.png 432w, https:\/\/www.cybermedian.com\/wp-content\/uploads\/2025\/12\/activity-diagram-Activity-and-Action-Nodes-300x201.png 300w, https:\/\/www.cybermedian.com\/wp-content\/uploads\/2025\/12\/activity-diagram-Activity-and-Action-Nodes-120x80.png 120w\" width=\"432\"\/><\/p>\n<ul>\n<li><strong>Notation :<\/strong> Un rectangle arrondi.<\/li>\n<li><strong>N\u0153ud d&#8217;action :<\/strong> Repr\u00e9sente une \u00e9tape atomique et non interrompable (par exemple, <em>V\u00e9rifier le stock<\/em>).<\/li>\n<li><strong>N\u0153ud d&#8217;activit\u00e9 :<\/strong> Repr\u00e9sente un objectif de haut niveau qui peut \u00eatre d\u00e9compos\u00e9 en sous-activit\u00e9s (par exemple, <em>Satisfaire la commande<\/em>).<\/li>\n<li><strong>Objectif :<\/strong> D\u00e9finir le travail qui doit \u00eatre effectu\u00e9.<\/li>\n<\/ul>\n<h3>B. Flux de contr\u00f4le (arcs)<\/h3>\n<p>Le flux de contr\u00f4le est la fl\u00e8che reliant deux n\u0153uds, montrant la transition d&#8217;une action \u00e0 la suivante.<\/p>\n<p><img alt=\"\" class=\"alignnone size-full wp-image-14475\" decoding=\"async\" height=\"233\" loading=\"lazy\" sizes=\"auto, (max-width: 432px) 100vw, 432px\" src=\"https:\/\/www.cybermedian.com\/wp-content\/uploads\/2025\/12\/activity-diagram-Control-Flow-Edgesv2.png\" srcset=\"https:\/\/www.cybermedian.com\/wp-content\/uploads\/2025\/12\/activity-diagram-Control-Flow-Edgesv2.png 432w, https:\/\/www.cybermedian.com\/wp-content\/uploads\/2025\/12\/activity-diagram-Control-Flow-Edgesv2-300x162.png 300w\" width=\"432\"\/><\/p>\n<ul>\n<li><strong>Notation :<\/strong> Une fl\u00e8che pleine.<\/li>\n<li><strong>Objectif :<\/strong> Indique la s\u00e9quence d&#8217;ex\u00e9cution.<\/li>\n<\/ul>\n<h3>C. N\u0153uds de d\u00e9part et de fin<\/h3>\n<p>Chaque diagramme doit avoir un point de d\u00e9part unique et un ou plusieurs points d&#8217;arriv\u00e9e.<\/p>\n<p><img alt=\"\" class=\"alignnone size-full wp-image-14472\" decoding=\"async\" height=\"217\" loading=\"lazy\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" src=\"https:\/\/www.cybermedian.com\/wp-content\/uploads\/2025\/12\/Start-and-End-Nodes.png\" srcset=\"https:\/\/www.cybermedian.com\/wp-content\/uploads\/2025\/12\/Start-and-End-Nodes.png 640w, https:\/\/www.cybermedian.com\/wp-content\/uploads\/2025\/12\/Start-and-End-Nodes-300x102.png 300w\" width=\"640\"\/><\/p>\n<ul>\n<li><strong>N\u0153ud initial (d\u00e9part) :<\/strong>\n<ul>\n<li><strong>Notation :<\/strong> Un cercle plein et solide.<\/li>\n<li><strong> But :<\/strong> Le point d&#8217;entr\u00e9e du flux de contr\u00f4le.<\/li>\n<\/ul>\n<\/li>\n<li><strong> N\u0153ud final d&#8217;activit\u00e9 (Fin) :<\/strong>\n<ul>\n<li><strong>Notation :<\/strong> Un cercle plein entour\u00e9 d&#8217;un cercle creux plus grand.<\/li>\n<li><strong> But :<\/strong> Indique la fin de tous les flux dans l&#8217;activit\u00e9.<\/li>\n<\/ul>\n<\/li>\n<li><strong> N\u0153ud final de flux :<\/strong>\n<ul>\n<li><strong>Notation :<\/strong> Un cercle avec un \u00ab X \u00bb \u00e0 l&#8217;int\u00e9rieur.<\/li>\n<li><strong> But :<\/strong> Indique la fin d&#8217;un chemin sp\u00e9cifique (flux), mais ne<strong>pas<\/strong> n\u00e9cessairement terminer l&#8217;activit\u00e9 globale.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2>Mod\u00e9lisation de la logique de d\u00e9cision et de branchement<\/h2>\n<p>Les diagrammes d&#8217;activit\u00e9 utilisent des n\u0153uds sp\u00e9cifiques pour g\u00e9rer la logique conditionnelle, tout comme<code>si-sinon<\/code> ou <code>switch<\/code> les instructions dans le code.<\/p>\n<h3>A. N\u0153uds de d\u00e9cision et de fusion<\/h3>\n<p>Ces n\u0153uds sont utilis\u00e9s pour mod\u00e9liser le branchement conditionnel et le r\u00e9tablissement ult\u00e9rieur de ces chemins.<\/p>\n<p><img alt=\"\" class=\"alignnone size-full wp-image-14476\" decoding=\"async\" height=\"231\" loading=\"lazy\" sizes=\"auto, (max-width: 588px) 100vw, 588px\" src=\"https:\/\/www.cybermedian.com\/wp-content\/uploads\/2025\/12\/Decision-Merge-Nodes.png\" srcset=\"https:\/\/www.cybermedian.com\/wp-content\/uploads\/2025\/12\/Decision-Merge-Nodes.png 588w, https:\/\/www.cybermedian.com\/wp-content\/uploads\/2025\/12\/Decision-Merge-Nodes-300x118.png 300w\" width=\"588\"\/><\/p>\n<ul>\n<li><strong>N\u0153ud de d\u00e9cision :<\/strong>\n<ul>\n<li><strong>Notation :<\/strong> Une forme de losange.<\/li>\n<li><strong> Utilisation :<\/strong> Un flux entrant unique et plusieurs flux sortants. Chaque flux sortant doit avoir une <strong>Condition de garde<\/strong> (une condition entre crochets, par exemple <code>[Stock &gt; 0]<\/code>) qui d\u00e9termine quel chemin est suivi.<\/li>\n<\/ul>\n<\/li>\n<li><strong>N\u0153ud de fusion :<\/strong>\n<ul>\n<li><strong>Notation :<\/strong> Une forme en losange.<\/li>\n<li><strong>Utilisation :<\/strong> Plusieurs flux entrants et un seul flux sortant. Il repr\u00e9sente simplement le point o\u00f9 diff\u00e9rentes branches se rejoignent, indiquant que n&#8217;importe quelle branche entrante peut conduire \u00e0 l&#8217;\u00e9tape suivante. Il ne synchronise pas les flux concurrents.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2>Mod\u00e9lisation de la concurrence et de la synchronisation<\/h2>\n<p>Contrairement \u00e0 <a href=\"https:\/\/online.visual-paradigm.com\/diagrams\/solutions\/free-flowchart-maker-online\/\">les diagrammes de flux <\/a>qui sont g\u00e9n\u00e9ralement s\u00e9quentiels, les diagrammes d&#8217;activit\u00e9 excellent \u00e0 repr\u00e9senter l&#8217;ex\u00e9cution parall\u00e8le \u00e0 l&#8217;aide de barres de synchronisation.<\/p>\n<h3>A. N\u0153uds de division et de fusion<\/h3>\n<p>Ces n\u0153uds sont utilis\u00e9s pour diviser un seul flux de contr\u00f4le en plusieurs flux concurrents, puis pour attendre que ces flux concurrents se terminent.<\/p>\n<p><img alt=\"\" class=\"alignnone size-full wp-image-14477\" decoding=\"async\" height=\"318\" loading=\"lazy\" sizes=\"auto, (max-width: 676px) 100vw, 676px\" src=\"https:\/\/www.cybermedian.com\/wp-content\/uploads\/2025\/12\/Fork-and-Join-Node.png\" srcset=\"https:\/\/www.cybermedian.com\/wp-content\/uploads\/2025\/12\/Fork-and-Join-Node.png 676w, https:\/\/www.cybermedian.com\/wp-content\/uploads\/2025\/12\/Fork-and-Join-Node-300x141.png 300w\" width=\"676\"\/><\/p>\n<ul>\n<li><strong>N\u0153ud de division :<\/strong>\n<ul>\n<li><strong>Notation :<\/strong> Une barre \u00e9paisse horizontale ou verticale.<\/li>\n<li><strong>Utilisation :<\/strong> Un seul flux entrant et plusieurs flux sortants. Tous les flux sortants commencent \u00e0 s&#8217;ex\u00e9cuter <em>concurrentes<\/em> (en parall\u00e8le) \u00e0 partir de ce point.<\/li>\n<\/ul>\n<\/li>\n<li><strong>N\u0153ud de fusion :<\/strong>\n<ul>\n<li><strong>Notation :<\/strong> Une barre \u00e9paisse horizontale ou verticale.<\/li>\n<li><strong>Utilisation :<\/strong> Plusieurs flux entrants et un seul flux sortant. Le flux sortant ne peut pas commencer tant que <strong>tous<\/strong> les flux entrants concurrents n&#8217;ont pas termin\u00e9 (synchronisation).<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2>\u00c9l\u00e9ments organisationnels : les nageoires<\/h2>\n<p><a href=\"https:\/\/guides.visual-paradigm.com\/a-guide-to-swimlane-activity-diagrams\/\">Nageoires<\/a> (appel\u00e9s \u00e9galement partitions) sont essentiels pour indiquer quel d\u00e9partement, composant ou acteur est responsable de quelle activit\u00e9. Ils divisent visuellement le diagramme en zones verticales ou horizontales.<\/p>\n<ul>\n<li><strong>Notation :<\/strong> Des lignes parall\u00e8les verticales ou horizontales s\u00e9parant diff\u00e9rentes zones de responsabilit\u00e9.<\/li>\n<li><strong>Objectif :<\/strong> Regrouper les actions par l&#8217;entit\u00e9 responsable de leur ex\u00e9cution, afin de garantir une responsabilit\u00e9 claire entre diff\u00e9rentes unit\u00e9s organisationnelles (par exemple, \u00ab Client \u00bb, \u00ab Syst\u00e8me Web \u00bb, \u00ab Entrep\u00f4t \u00bb).<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"https:\/\/online.visual-paradigm.com\/repository\/images\/963809e4-f9d7-4d8e-8729-5df34911c892\/activity-diagram-design\/order-fulfilment.png\"\/><\/p>\n<h2>R\u00e9sum\u00e9 des meilleures pratiques pour les diagrammes d&#8217;activit\u00e9<\/h2>\n<ul>\n<li><strong>Mod\u00e9liser le flux, pas les objets :<\/strong> Concentrez-vous sur la s\u00e9quence des \u00e9tapes et le flux de contr\u00f4le, et non sur les relations structurelles entre les classes (c&#8217;est le r\u00f4le du diagramme de classes).<\/li>\n<li><strong>Utilisez les nageoires :<\/strong> Utilisez toujours les nageoires pour d\u00e9limiter clairement qui ou quoi effectue chaque action, notamment dans les processus commerciaux transversaux.<\/li>\n<li><strong>\u00c9tiquetez les gardes :<\/strong> Assurez-vous que chaque flux sortant d&#8217;un n\u0153ud de d\u00e9cision soit \u00e9tiquet\u00e9 avec une condition de garde claire et mutuellement exclusive (par exemple, <code>[A]<\/code>, <code>[B]<\/code>, <code>[Sinon]<\/code>).<\/li>\n<li><strong>Synchronisez les forks :<\/strong> Chaque <strong>Fork<\/strong> doit \u00eatre \u00e9quilibr\u00e9 par un <strong>Join<\/strong> afin de garantir que les \u00e9tapes suivantes attendent que toutes les activit\u00e9s parall\u00e8les soient termin\u00e9es.<\/li>\n<\/ul>\n<p>Pour une compr\u00e9hension plus approfondie du UML et des fa\u00e7ons dont l&#8217;IA peut le visualiser, explorez notre <a href=\"https:\/\/www.cybermedian.com\/the-definitive-guide-to-the-unified-modeling-language-uml\/\">centre de ressources UML<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Le Diagramme d&#8217;activit\u00e9 UMLest fondamentalement un organigramme qui mod\u00e9lise les \u00e9tapes s\u00e9quentielles et concurrentes, ou activit\u00e9s, d&#8217;un processus. Il est<\/p>\n","protected":false},"author":5,"featured_media":10673,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"Un guide complet du diagramme d'activit\u00e9 UML. Apprenez \u00e0 mod\u00e9liser le flux s\u00e9quentiel et concurrent du syst\u00e8me \u00e0 l'aide d'actions, de d\u00e9cisions, de forks, de joins et de nageoires organisationnelles pour une analyse de flux de travail robuste.","_yoast_wpseo_metadesc":"A complete guide to the UML Activity Diagram. Learn how to model sequential and concurrent system flow using actions, decisions, forks, joins, and organizational swimlanes for robust workflow analysis.","footnotes":""},"categories":[3],"tags":[],"class_list":["post-10672","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-unified-modeling-language"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Un guide complet du diagramme d&#039;activit\u00e9 UML. Apprenez \u00e0 mod\u00e9liser le flux s\u00e9quentiel et concurrent du syst\u00e8me \u00e0 l&#039;aide d&#039;actions, de d\u00e9cisions, de forks, de joins et de nageoires organisationnelles pour une analyse de flux de travail robuste.<\/title>\n<meta name=\"description\" content=\"A complete guide to the UML Activity Diagram. 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