{"id":12570,"date":"2026-08-03T15:17:00","date_gmt":"2026-08-03T07:17:00","guid":{"rendered":"https:\/\/www.cybermedian.com\/fr\/use-case-driven-approach-guide\/"},"modified":"2026-09-03T22:38:39","modified_gmt":"2026-09-03T14:38:39","slug":"use-case-driven-approach-guide","status":"publish","type":"post","link":"https:\/\/www.cybermedian.com\/fr\/use-case-driven-approach-guide\/","title":{"rendered":"Ma\u00eetriser l&#8217;approche pilot\u00e9e par les cas d&#8217;utilisation : un guide complet des exigences et de la conception"},"content":{"rendered":"<div>\n<div>\n<div>\n<div>\n<div>\n<h2>Introduction<\/h2>\n<p>En g\u00e9nie logiciel, combler l&#8217;\u00e9cart entre les besoins des parties prenantes et la mise en \u0153uvre technique est souvent la phase la plus difficile du d\u00e9veloppement. L&#8217;<a href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-use-case-diagram\/\"><strong>approche pilot\u00e9e par les cas d&#8217;utilisation<\/strong>\u00a0<\/a>offre une m\u00e9thodologie structur\u00e9e et it\u00e9rative pour r\u00e9soudre ce probl\u00e8me. En se concentrant sur<em>la mani\u00e8re dont les utilisateurs interagissent avec le syst\u00e8me<\/em>pour atteindre des objectifs sp\u00e9cifiques, cette approche garantit que les exigences sont claires, testables et directement tra\u00e7ables vers les artefacts de conception.<\/p>\n<p>Ce guide propose un parcours complet de l&#8217;<a href=\"https:\/\/www.visual-paradigm.com\/solution\/use-case-driven-agile-approach\/\">approche pilot\u00e9e par les cas d&#8217;utilisation<\/a>, en passant des exigences de haut niveau \u00e0 la conception d\u00e9taill\u00e9e. Nous utiliserons un exemple unique et continu \u2014 un<strong>syst\u00e8me de gestion des commandes en ligne<\/strong>\u2014pour illustrer chaque \u00e9tape, assurant ainsi la coh\u00e9rence et la clart\u00e9 tout au long du processus.<\/p>\n<hr\/>\n<h2>Aper\u00e7u de la m\u00e9thodologie<\/h2>\n<p>L&#8217;approche pilot\u00e9e par les cas d&#8217;utilisation suit une progression naturelle de haut en bas. Chaque \u00e9tape affine la pr\u00e9c\u00e9dente, ajoutant de la pr\u00e9cision et r\u00e9duisant l&#8217;ambigu\u00eft\u00e9.<\/p>\n<p id=\"evBQyyp\"><img alt=\"Aper\u00e7u de la m\u00e9thodologie : Approche pilot\u00e9e par les cas d'usage avec IA + VPasCode\" class=\"alignnone wp-image-19634 size-full\" decoding=\"async\" height=\"559\" loading=\"lazy\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" src=\"https:\/\/www.cybermedian.com\/wp-content\/uploads\/2026\/08\/img_6a704033c90ce.png\" srcset=\"https:\/\/www.cybermedian.com\/wp-content\/uploads\/2026\/08\/img_6a704033c90ce.png 1024w, https:\/\/www.cybermedian.com\/wp-content\/uploads\/2026\/08\/img_6a704033c90ce-300x164.png 300w, https:\/\/www.cybermedian.com\/wp-content\/uploads\/2026\/08\/img_6a704033c90ce-768x419.png 768w\" width=\"1024\"\/><\/p>\n<h3>Pourquoi cet ordre est-il important ?<\/h3>\n<ol>\n<li><strong><a href=\"https:\/\/online.visual-paradigm.com\/diagrams\/tutorials\/use-case-diagram-tutorial\/\">Diagramme de cas d&#8217;utilisation<\/a>:<\/strong>Fournit un inventaire complet des capacit\u00e9s et du p\u00e9rim\u00e8tre. Il est rapide \u00e0 parcourir et id\u00e9al pour un accord des parties prenantes sur<em>ce<\/em>que fait le syst\u00e8me.<\/li>\n<li><strong><a href=\"https:\/\/www.visual-paradigm.com\/guide\/use-case\/what-is-use-case-specification\/\">Description du cas d&#8217;utilisation<\/a>:<\/strong>L\u00e8ve l&#8217;ambigu\u00eft\u00e9 en fixant les pr\u00e9conditions, les postconditions, les acteurs et la priorit\u00e9. Il \u00ab fige \u00bb le contrat de comportement.<\/li>\n<li><strong><a href=\"https:\/\/www.visual-paradigm.com\/tutorials\/flowofeventeditor.jsp\">Flux d&#8217;\u00e9v\u00e9nements<\/a>:<\/strong>Transforme le contrat en \u00e9tapes concr\u00e8tes et testables. Cela sert de mati\u00e8re premi\u00e8re tant pour les cas de test que pour la conception technique.<\/li>\n<li><strong><a href=\"https:\/\/www.visual-paradigm.com\/VPGallery\/diagrams\/Activity.html\">Activit\u00e9<\/a>\/<a href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-sequence-diagram\/\">Diagramme de s\u00e9quence<\/a>:<\/strong>\u00a0Fait office de pont vers le code. Il identifie les objets participants, leurs responsabilit\u00e9s, les \u00e9changes de messages et les r\u00e8gles de branchement exactes.<\/li>\n<\/ol>\n<hr\/>\n<h2>\u00c9tape 1 : Diagramme des cas d&#8217;utilisation (exigences)<\/h2>\n<p>Le diagramme des cas d&#8217;utilisation capture\u00a0<strong>qui<\/strong>\u00a0interagit avec le syst\u00e8me (<strong>acteurs<\/strong>) et\u00a0<strong>ce qu&#8217;ils<\/strong>\u00a0peuvent faire (<strong>cas d&#8217;utilisation<\/strong>), ainsi que les relations entre eux.<\/p>\n<h3>Concepts cl\u00e9s<\/h3>\n<ul>\n<li><strong>Acteur principal :<\/strong>\u00a0D\u00e9clenche le cas d&#8217;utilisation (plac\u00e9 \u00e0 gauche).<\/li>\n<li><strong>Acteur secondaire :<\/strong>\u00a0Soutient le syst\u00e8me ou re\u00e7oit des notifications (plac\u00e9 \u00e0 droite).<\/li>\n<li><strong>Limite du syst\u00e8me :<\/strong>\u00a0Le rectangle d\u00e9finissant la port\u00e9e du syst\u00e8me.<\/li>\n<li><strong><code data-backticks=\"1\">&lt;&lt;inclure&gt;&gt;<\/code>:<\/strong>\u00a0Repr\u00e9sente un comportement partag\u00e9 obligatoire. Si le cas d&#8217;utilisation A inclut le cas d&#8217;utilisation B, B\u00a0<em>doit<\/em>\u00a0se produire pour que A soit termin\u00e9.<\/li>\n<li><strong><code data-backticks=\"1\">&lt;&lt;\u00e9tendre&gt;&gt;<\/code>:<\/strong>\u00a0Repr\u00e9sente un comportement optionnel. Le cas d&#8217;utilisation B \u00e9tend le cas d&#8217;utilisation A uniquement dans des conditions sp\u00e9cifiques.<\/li>\n<\/ul>\n<h3>Exemple : Syst\u00e8me de gestion des commandes en ligne<\/h3>\n<p id=\"tvaWVJN\"><img alt=\"Diagramme de cas d'usage pour un syst\u00e8me de gestion de commandes en ligne montrant les interactions entre le Client et l'Entrep\u00f4t.\" class=\"alignnone size-full wp-image-19640\" decoding=\"async\" height=\"874\" loading=\"lazy\" sizes=\"auto, (max-width: 1917px) 100vw, 1917px\" src=\"https:\/\/www.cybermedian.com\/wp-content\/uploads\/2026\/08\/img_6a70411b9ee3e.png\" srcset=\"https:\/\/www.cybermedian.com\/wp-content\/uploads\/2026\/08\/img_6a70411b9ee3e.png 1917w, https:\/\/www.cybermedian.com\/wp-content\/uploads\/2026\/08\/img_6a70411b9ee3e-300x137.png 300w, https:\/\/www.cybermedian.com\/wp-content\/uploads\/2026\/08\/img_6a70411b9ee3e-1024x467.png 1024w, https:\/\/www.cybermedian.com\/wp-content\/uploads\/2026\/08\/img_6a70411b9ee3e-768x350.png 768w, https:\/\/www.cybermedian.com\/wp-content\/uploads\/2026\/08\/img_6a70411b9ee3e-1536x700.png 1536w\" width=\"1917\"\/><\/p>\n<pre class=\"lang-puml\"><code data-language=\"puml\">@startuml\r\nskinparam linetype ortho\r\nskinparam defaultFontSize 14\r\nskinparam defaultFontColor #333333\r\nskinparam vpDiagramType UseCaseDiagram\r\nskinparam actor {\r\n  BackgroundColor #E8F5E9\r\n}\r\nskinparam usecase {\r\n  BackgroundColor #BBDEFB\r\n  BorderColor #1976D2\r\n  ArrowColor #1976D2\r\n}\r\n\r\nleft to right direction\r\nactor \"Clientn(Principal)\" as cust\r\nactor \"Entrep\u00f4tn(Secondaire)\" as wh\r\n\r\nrectangle \"Syst\u00e8me de gestion des commandes\" {\r\n  usecase \"Passer une commande\" as UC1\r\n  usecase \"Annuler une commande\" as UC2\r\n  usecase \"Suivre une commande\" as UC3\r\n  usecase \"Connexion\" as UC4\r\n  usecase \"Imprimer la facture\" as UC5\r\n}\r\n\r\ncust -[#black]- UC1\r\ncust -[#black]- UC2\r\ncust -[#black]- UC3\r\nUC1 -[#crimson]- wh\r\nUC2 -[#crimson]- wh\r\nUC1 ...&gt; UC4 : &lt;&lt;inclure&gt;&gt;\r\nUC2 ...&gt; UC4 : &lt;&lt;inclure&gt;&gt;\r\nUC3 ...&gt; UC4 : &lt;&lt;inclure&gt;&gt;\r\nUC1 &lt;... UC5 : &lt;&lt;\u00e9tendre&gt;&gt;\r\n@enduml\r\n<\/code><\/pre>\n<p><strong>Analyse du diagramme :<\/strong><\/p>\n<ul>\n<li>Le\u00a0<strong>Client<\/strong> initie la passation, l&#8217;annulation et le suivi des commandes.<\/li>\n<li>Le<strong>Entrep\u00f4t<\/strong> est impliqu\u00e9 dans la passation et l&#8217;annulation des commandes (probablement pour les mises \u00e0 jour des stocks).<\/li>\n<li><strong>Connexion<\/strong> est inclus dans Passer, Annuler et Suivre les commandes, ce qui signifie que l&#8217;authentification est obligatoire pour ces actions.<\/li>\n<li><strong>Imprimer la facture<\/strong> \u00e9tend Passer une commande, ce qui signifie qu&#8217;il s&#8217;agit d&#8217;une \u00e9tape facultative qui peut survenir apr\u00e8s qu&#8217;une commande a \u00e9t\u00e9 pass\u00e9e.<\/li>\n<\/ul>\n<hr\/>\n<h2>\u00c9tape 2 : Description du cas d&#8217;utilisation (Sp\u00e9cification)<\/h2>\n<p>Un diagramme nomme les cas d&#8217;utilisation mais manque de d\u00e9tails. Le<a href=\"https:\/\/www.visual-paradigm.com\/features\/use-case-description\/\">Tableau de description des cas d&#8217;utilisation<\/a>e sp\u00e9cifie le contrat pr\u00e9cis pour chaque cas d&#8217;utilisation.<\/p>\n<h3>Exemple : UC-01 Passer une commande<\/h3>\n<table>\n<thead>\n<tr>\n<th>Champ<\/th>\n<th>Valeur<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Identifiant du cas d&#8217;utilisation<\/strong><\/td>\n<td>UC-01<\/td>\n<\/tr>\n<tr>\n<td><strong>Nom<\/strong><\/td>\n<td>Passer une commande<\/td>\n<\/tr>\n<tr>\n<td><strong>Acteur principal<\/strong><\/td>\n<td>Client<\/td>\n<\/tr>\n<tr>\n<td><strong>Acteur secondaire<\/strong><\/td>\n<td>Entrep\u00f4t<\/td>\n<\/tr>\n<tr>\n<td><strong>Pr\u00e9conditions<\/strong><\/td>\n<td>Le client est connect\u00e9 ; le panier contient au moins un article ; les articles sont en stock<\/td>\n<\/tr>\n<tr>\n<td><strong>Postconditions (Succ\u00e8s)<\/strong><\/td>\n<td>La commande est enregistr\u00e9e avec le statut<code data-backticks=\"1\">confirm\u00e9e<\/code>; le paiement est encaiss\u00e9 ; un num\u00e9ro de suivi est \u00e9mis<\/td>\n<\/tr>\n<tr>\n<td><strong>Postconditions (\u00c9chec)<\/strong><\/td>\n<td>Aucune commande cr\u00e9\u00e9e ; panier inchang\u00e9 ; utilisateur inform\u00e9 de la raison<\/td>\n<\/tr>\n<tr>\n<td><strong>Flux principal<\/strong><\/td>\n<td>\u2192 Voir \u00c9tape 3<\/td>\n<\/tr>\n<tr>\n<td><strong>Flux alternatifs \/ exceptions<\/strong><\/td>\n<td>Stock insuffisant ; paiement refus\u00e9<\/td>\n<\/tr>\n<tr>\n<td><strong>Priorit\u00e9<\/strong><\/td>\n<td>\u00c9lev\u00e9e<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>Objectif :<\/strong>\u00a0Cette \u00e9tape d\u00e9finit ce qui doit \u00eatre vrai\u00a0<em>avant<\/em>\u00a0l&#8217;ex\u00e9cution du cas d&#8217;utilisation (pr\u00e9conditions) et ce qui doit \u00eatre vrai\u00a0<em>apr\u00e8s<\/em>\u00a0(postconditions), \u00e9tablissant des crit\u00e8res de succ\u00e8s\/\u00e9chec clairs.<\/p>\n<hr\/>\n<h2>\u00c9tape 3 : <a href=\"https:\/\/guides.visual-paradigm.com\/mastering-use-case-elaboration-flow-of-events-and-sequence-diagrams\/\">Flux d&#8217;\u00e9v\u00e9nements<\/a> (Sc\u00e9narios)<\/h2>\n<p>C&#8217;est le c\u0153ur comportemental de l&#8217;approche. Le cas d&#8217;utilisation \u00ab Passer une commande \u00bb se d\u00e9veloppe en un\u00a0<strong>script de sc\u00e9nario<\/strong>\u2014une s\u00e9quence d&#8217;\u00e9tapes num\u00e9rot\u00e9es r\u00e9dig\u00e9e avant l&#8217;existence de tout diagramme de conception d\u00e9taill\u00e9.<\/p>\n<h3>Sc\u00e9nario principal de succ\u00e8s (flux de base)<\/h3>\n<ol>\n<li>Le client se connecte.<\/li>\n<li>Le client valide le panier avec les articles s\u00e9lectionn\u00e9s.<\/li>\n<li>Le syst\u00e8me valide le contenu du panier et la disponibilit\u00e9 du stock.<\/li>\n<li>Le syst\u00e8me pr\u00e9l\u00e8ve le montant total via la passerelle de paiement.<\/li>\n<li>Le syst\u00e8me enregistre la commande avec le statut\u00a0<code data-backticks=\"1\">confirm\u00e9e<\/code>.<\/li>\n<li>Le syst\u00e8me renvoie une confirmation de commande avec un num\u00e9ro de commande.<\/li>\n<li>Le syst\u00e8me notifie l&#8217;entrep\u00f4t pour pr\u00e9parer, emballer et exp\u00e9dier.<\/li>\n<\/ol>\n<h3>Sc\u00e9narios alternatifs<\/h3>\n<ul>\n<li><strong>3a. Stock insuffisant :<\/strong> Le syst\u00e8me signale les articles indisponibles et retourne au panier.<\/li>\n<li><strong>4a. Paiement refus\u00e9 :<\/strong> Le syst\u00e8me informe le client et ne cr\u00e9e pas la commande.<\/li>\n<\/ul>\n<p><strong>Convention cl\u00e9 :<\/strong> Chaque sc\u00e9nario correspond directement \u00e0 une \u00e9tape de la description. Ces flux servent de base aux diagrammes d&#8217;activit\u00e9 et de s\u00e9quence de l&#8217;\u00e9tape suivante.<\/p>\n<hr\/>\n<h2>\u00c9tape 4 : Conception d\u00e9taill\u00e9e (diagrammes de s\u00e9quence et d&#8217;activit\u00e9)<\/h2>\n<p>\u00c0 cette \u00e9tape, vous choisissez la notation en fonction de l&#8217;aspect du syst\u00e8me que vous souhaitez mettre en \u00e9vidence.<\/p>\n<ul>\n<li><strong><a href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-sequence-diagram\/\">Diagramme de s\u00e9quence<\/a>:<\/strong> Met en \u00e9vidence<strong>les lignes de vie, l&#8217;ordre des messages et les responsabilit\u00e9s entre les objets<\/strong>. Id\u00e9al pour d\u00e9couvrir les classes et les m\u00e9thodes.<\/li>\n<li><strong>Diagramme d&#8217;activit\u00e9 :<\/strong> Met en \u00e9vidence<strong>le flux de contr\u00f4le et les d\u00e9cisions via les couloirs\/parties<\/strong>. Id\u00e9al pour documenter les processus et les responsabilit\u00e9s des r\u00f4les.<\/li>\n<\/ul>\n<h3>4A. <a href=\"https:\/\/www.visual-paradigm.com\/learning\/handbooks\/software-design-handbook\/sequence-diagram.jsp\">Diagramme de s\u00e9quence<\/a> (Perspective d&#8217;interaction)<\/h3>\n<p id=\"AXQWPIw\"><img alt=\"Diagramme de s\u00e9quence illustrant le flux de travail de Passer une commande avec les interactions entre le Client, le Service de Commande, la Passerelle de Paiement et la Base de donn\u00e9es de Commandes.\" class=\"alignnone size-full wp-image-19639\" decoding=\"async\" height=\"875\" loading=\"lazy\" sizes=\"auto, (max-width: 1917px) 100vw, 1917px\" src=\"https:\/\/www.cybermedian.com\/wp-content\/uploads\/2026\/08\/img_6a7040f350272.png\" srcset=\"https:\/\/www.cybermedian.com\/wp-content\/uploads\/2026\/08\/img_6a7040f350272.png 1917w, https:\/\/www.cybermedian.com\/wp-content\/uploads\/2026\/08\/img_6a7040f350272-300x137.png 300w, https:\/\/www.cybermedian.com\/wp-content\/uploads\/2026\/08\/img_6a7040f350272-1024x467.png 1024w, https:\/\/www.cybermedian.com\/wp-content\/uploads\/2026\/08\/img_6a7040f350272-768x351.png 768w, https:\/\/www.cybermedian.com\/wp-content\/uploads\/2026\/08\/img_6a7040f350272-1536x701.png 1536w\" width=\"1917\"\/><\/p>\n<pre class=\"lang-puml\"><code data-language=\"puml\">@startuml\r\ntitle Diagramme de s\u00e9quence de passation de commande\r\nskinparam linetype ortho\r\nskinparam defaultFontSize 14\r\nskinparam defaultFontColor #333333\r\nskinparam sequenceParticipant underline\r\nskinparam vpDiagramType InteractionDiagram\r\nskinparam {\r\n  FontSize 14\r\n  ArrowColor #4A4A4A\r\n  ArrowFontColor #4A4A4A\r\n  BackgroundColor #FFFFFF\r\n  BorderColor #DEDEDE\r\n  FontColor #333333\r\n  Participant {\r\n    BorderColor #0077B6\r\n    BackgroundColor #F0F8FF\r\n    FontColor #005691\r\n  }\r\n  Actor {\r\n    BorderColor #6A057F\r\n    BackgroundColor #F5EEF8\r\n    FontColor #510363\r\n  }\r\n  Sequence {\r\n    ArrowThickness 2\r\n    LifeLineBorderColor #444444\r\n    LifeLineBackgroundColor #F7F7F7\r\n    BoxBorderColor #AAAAAA\r\n    BoxBackgroundColor #FFFFFF\r\n    BoxFontColor #333333\r\n  }\r\n}\r\n\r\nactor \"Client\" as USR\r\nparticipant \"Service de commande\" as OS\r\nparticipant \"Passerelle de paiement\" as PG\r\ndatabase \"Base de donn\u00e9es de commande\" as DB\r\n\r\nactivate USR\r\nUSR -&gt; OS : submitOrder(items)\r\nactivate OS\r\nalt Validation &amp; Paiement\r\n  OS -&gt; OS : validateCart(items)\r\n  OS -&gt; PG : charge(total)\r\n  activate PG\r\n  PG --&gt; OS : paymentOk\r\n  deactivate PG\r\n  OS -&gt; DB : saveOrder(status=confirmed)\r\n  activate DB\r\n  DB --&gt; OS : orderId\r\n  deactivate DB\r\n  OS --&gt; USR : orderConfirmation(orderId)\r\nelse Stock insuffisant\r\n  OS -&gt; DB : checkStock(items)\r\n  activate DB\r\n  DB --&gt; OS : stockUnavailable\r\n  deactivate DB\r\n  OS --&gt; USR : error(\"En rupture de stock\")\r\nelse \u00c9chec du paiement\r\n  PG --&gt; OS : paymentFailed\r\n  OS --&gt; USR : error(\"Paiement refus\u00e9\")\r\nend\r\ndeactivate OS\r\n@enduml\r\n<\/code><\/pre>\n<p><strong>Concepts cl\u00e9s :<\/strong><\/p>\n<ul>\n<li><strong>Appels synchrones :<\/strong> Fl\u00e8ches pleines (<code data-backticks=\"1\">-&gt;<\/code>).<\/li>\n<li><strong>R\u00e9ponses :<\/strong> Fl\u00e8ches pointill\u00e9es (<code data-backticks=\"1\">--&gt;<\/code>).<\/li>\n<li><strong>Barres d&#8217;activation :<\/strong> Affiche la dur\u00e9e de vie du traitement d&#8217;un objet.<\/li>\n<li><strong><code data-backticks=\"1\">alt<\/code> Fragment combin\u00e9 :<\/strong> Regroupe les trois sc\u00e9narios (Succ\u00e8s, Stock insuffisant, \u00c9chec du paiement), refl\u00e9tant directement le flux d&#8217;\u00e9v\u00e9nements de l&#8217;\u00e9tape 3.<\/li>\n<\/ul>\n<h3>4B. <a href=\"https:\/\/www.visual-paradigm.com\/VPGallery\/diagrams\/Activity.html\">Diagramme d&#8217;activit\u00e9<\/a> (Perspective processus)<\/h3>\n<p id=\"OlDcrcu\"><img alt=\"Interface VPasCode affichant un diagramme d'activit\u00e9 de Passer une commande avec des couloirs pour le Client, le Syst\u00e8me et l'Entrep\u00f4t.\" class=\"alignnone size-full wp-image-19641\" decoding=\"async\" height=\"874\" loading=\"lazy\" sizes=\"auto, (max-width: 1918px) 100vw, 1918px\" src=\"https:\/\/www.cybermedian.com\/wp-content\/uploads\/2026\/08\/img_6a70415b23cc1.png\" srcset=\"https:\/\/www.cybermedian.com\/wp-content\/uploads\/2026\/08\/img_6a70415b23cc1.png 1918w, https:\/\/www.cybermedian.com\/wp-content\/uploads\/2026\/08\/img_6a70415b23cc1-300x137.png 300w, https:\/\/www.cybermedian.com\/wp-content\/uploads\/2026\/08\/img_6a70415b23cc1-1024x467.png 1024w, https:\/\/www.cybermedian.com\/wp-content\/uploads\/2026\/08\/img_6a70415b23cc1-768x350.png 768w, https:\/\/www.cybermedian.com\/wp-content\/uploads\/2026\/08\/img_6a70415b23cc1-1536x700.png 1536w\" width=\"1918\"\/><\/p>\n<pre class=\"lang-puml\"><code data-language=\"puml\">@startuml\r\n&lt;style&gt;\r\n  element { MaximumWidth 150 }\r\n  start   { Backgroundcolor #00695C }\r\n  stop    { Backgroundcolor #C2185B }\r\n  activity{ Backgroundcolor #81D4FA; MaximumWidth 150 }\r\n  diamond { Backgroundcolor #FFB74D; MaximumWidth 80 }\r\n  arrow   { LineColor #424242; Fontcolor #000000 }\r\n  swimlane{ Fontcolor #000000; FontSize 14 }\r\n&lt;\/style&gt;\r\ntitle Diagramme d'activit\u00e9 de passation de commande\r\n\r\n|#F0F8FF|Client|\r\nstart\r\n:Connexion;\r\n:Parcourir le catalogue;\r\n:Ajouter des articles au panier;\r\n\r\nif (Pr\u00eat \u00e0 passer la commande ?) then (oui)\r\n  :Passer \u00e0 la caisse;\r\nelse (non)\r\n  :Retour \u00e0 la navigation;\r\n  stop\r\nendif\r\n\r\n|#E8F5E9|Syst\u00e8me|\r\n:Valider le panier;\r\n:Traiter le paiement;\r\n\r\nif (Paiement approuv\u00e9 ?) then (oui)\r\n  :Cr\u00e9er la commande (status=confirm\u00e9e);\r\nelse (non)\r\n  :Notifier l'\u00e9chec du paiement;\r\nendif\r\n\r\n|#F5EEF8|Entrep\u00f4t|\r\nif (Paiement approuv\u00e9 ?) then (oui)\r\n  :Pr\u00e9parer et emballer les articles;\r\n  :Exp\u00e9dier la commande;\r\n  :Envoyer le num\u00e9ro de suivi;\r\n  stop\r\nelse (non)\r\n  stop\r\nendif\r\n@enduml\r\n<\/code><\/pre>\n<p id=\"JVZgQMi\"><img alt=\"Diagramme d'activit\u00e9 de Passer une commande illustrant le flux du processus \u00e0 travers les couloirs du Client, du Syst\u00e8me et de l'Entrep\u00f4t.\" class=\"alignnone size-full wp-image-19642\" decoding=\"async\" height=\"917\" loading=\"lazy\" sizes=\"auto, (max-width: 843px) 100vw, 843px\" src=\"https:\/\/www.cybermedian.com\/wp-content\/uploads\/2026\/08\/img_6a7041742d648.png\" srcset=\"https:\/\/www.cybermedian.com\/wp-content\/uploads\/2026\/08\/img_6a7041742d648.png 843w, https:\/\/www.cybermedian.com\/wp-content\/uploads\/2026\/08\/img_6a7041742d648-276x300.png 276w, https:\/\/www.cybermedian.com\/wp-content\/uploads\/2026\/08\/img_6a7041742d648-768x835.png 768w\" width=\"843\"\/><strong>Concepts cl\u00e9s :<\/strong><\/p>\n<ul>\n<li><strong><a href=\"https:\/\/guides.visual-paradigm.com\/a-guide-to-swimlane-activity-diagrams\/\">Couloirs<\/a>:<\/strong> Attribuer chaque action \u00e0 la partie responsable (Client, Syst\u00e8me, Entrep\u00f4t).<\/li>\n<li><strong>N\u0153uds de d\u00e9cision :<\/strong>\u00a0<code data-backticks=\"1\">if\/then\/else\/endif<\/code> les structures codent les sc\u00e9narios de branchement.<\/li>\n<li><strong>Marqueurs de d\u00e9but\/fin :<\/strong> D\u00e9limitent le d\u00e9but et la fin du processus.<\/li>\n<\/ul>\n<hr\/>\n<h2>Points cl\u00e9s de PlantUML<\/h2>\n<p>Pour mod\u00e9liser efficacement cette approche avec PlantUML, retenez les \u00e9l\u00e9ments essentiels de la syntaxe suivants :<\/p>\n<ol>\n<li><strong><a href=\"https:\/\/www.visual-paradigm.com\/solution\/free-use-case-tool\/\">Diagrammes de cas d&#8217;utilisation<\/a>:<\/strong>\n<ul>\n<li>Utilisez <code data-backticks=\"1\">usecase<\/code> pour les fonctions.<\/li>\n<li>Utilisez <code data-backticks=\"1\">...&gt;<\/code> pour <code data-backticks=\"1\">&lt;&lt;include&gt;&gt;<\/code>\u00a0relations.<\/li>\n<li>Utilisez\u00a0<code data-backticks=\"1\">&lt;...<\/code>\u00a0pour\u00a0<code data-backticks=\"1\">&lt;&lt;extend&gt;&gt;<\/code>\u00a0relations.<\/li>\n<li>Utilisez\u00a0<code data-backticks=\"1\">rectangle \"Nom du syst\u00e8me\" {}<\/code>\u00a0pour d\u00e9finir la limite du syst\u00e8me.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Diagrammes de s\u00e9quence :<\/strong>\n<ul>\n<li>D\u00e9finissez les participants en utilisant\u00a0<code data-backticks=\"1\">acteur<\/code>,\u00a0<code data-backticks=\"1\">participant<\/code>, ou\u00a0<code data-backticks=\"1\">base de donn\u00e9es<\/code>.<\/li>\n<li>Utilisez\u00a0<code data-backticks=\"1\">-&gt;<\/code>\u00a0pour les appels synchrones et\u00a0<code data-backticks=\"1\">--&gt;<\/code>\u00a0pour les r\u00e9ponses.<\/li>\n<li>Utilisez\u00a0<code data-backticks=\"1\">activer<\/code>\u00a0et\u00a0<code data-backticks=\"1\">d\u00e9sactiver<\/code>\u00a0pour afficher les dur\u00e9es de vie des objets.<\/li>\n<li>Utilisez\u00a0<code data-backticks=\"1\">alt<\/code>,\u00a0<code data-backticks=\"1\">sinon<\/code>, et <code data-backticks=\"1\">fin<\/code> pour les fragments combin\u00e9s repr\u00e9sentant des flux alternatifs.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Diagrammes d&#8217;activit\u00e9 :<\/strong>\n<ul>\n<li>Utilisez <code data-backticks=\"1\">|#color|NomDeCouloir|<\/code> pour d\u00e9finir les couloirs.<\/li>\n<li>Utilisez <code data-backticks=\"1\">:action;<\/code> pour les activit\u00e9s.<\/li>\n<li>Utilisez <code data-backticks=\"1\">if\/else\/endif<\/code> pour les n\u0153uds de d\u00e9cision.<\/li>\n<li>Utilisez <code data-backticks=\"1\">d\u00e9marrage<\/code> et <code data-backticks=\"1\">arr\u00eat<\/code> pour marquer les limites du processus.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<hr\/>\n<h2>Conclusion<\/h2>\n<p>L&#8217; <a href=\"https:\/\/blog.visual-paradigm.com\/use-case-diagram-tutorial\/\">Approche pilot\u00e9e par les cas d&#8217;utilisation<\/a> est plus qu&#8217;une simple technique de documentation ; c&#8217;est un cadre pour un raffinement progressif. En commen\u00e7ant par la vue d&#8217;ensemble (<a href=\"https:\/\/www.visual-paradigm.com\/support\/documents\/vpuserguide\/94\/2575_usecasediagr.html\">Diagramme de cas d&#8217;utilisation<\/a>) et en approfondissant les comportements sp\u00e9cifiques (Flux d&#8217;\u00e9v\u00e9nements) et les interactions techniques (<a href=\"https:\/\/www.visual-paradigm.com\/VPGallery\/diagrams\/Sequence.html\">S\u00e9quence<\/a>\/<a href=\"https:\/\/online.visual-paradigm.com\/diagrams\/tutorials\/activity-diagram-tutorial\/\">Diagrammes d&#8217;activit\u00e9<\/a>), les \u00e9quipes peuvent s&#8217;assurer que chaque ligne de code remonte \u00e0 un besoin utilisateur v\u00e9rifi\u00e9.<\/p>\n<p class=\"\">Cette m\u00e9thode r\u00e9duit le risque de malentendus entre les parties prenantes et les d\u00e9veloppeurs, facilite des tests plus simples gr\u00e2ce \u00e0 des sc\u00e9narios clairs, et aboutit \u00e0 une conception de syst\u00e8me robuste et centr\u00e9e sur l&#8217;utilisateur. Que vous construisiez une plateforme de commerce \u00e9lectronique simple ou un syst\u00e8me d&#8217;entreprise complexe, le respect de cette progression structur\u00e9e conduira \u00e0 des exigences plus claires et \u00e0 un logiciel de meilleure qualit\u00e9.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Introduction En g\u00e9nie logiciel, combler l&#8217;\u00e9cart entre les besoins des parties prenantes et la mise en \u0153uvre technique est souvent<\/p>\n","protected":false},"author":11,"featured_media":12571,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"","footnotes":""},"categories":[79,3],"tags":[],"class_list":["post-12570","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ai-chatbot","category-unified-modeling-language"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.7 - 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