{"id":6402,"date":"2026-02-04T18:24:32","date_gmt":"2026-02-04T10:24:32","guid":{"rendered":"https:\/\/guides.visual-paradigm.com\/ja\/navigating-the-development-seas-a-comprehensive-guide-to-using-use-case-sequence-and-activity-diagrams-in-it-systems\/"},"modified":"2026-02-04T18:24:32","modified_gmt":"2026-02-04T10:24:32","slug":"navigating-the-development-seas-a-comprehensive-guide-to-using-use-case-sequence-and-activity-diagrams-in-it-systems","status":"publish","type":"post","link":"https:\/\/guides.visual-paradigm.com\/ja\/navigating-the-development-seas-a-comprehensive-guide-to-using-use-case-sequence-and-activity-diagrams-in-it-systems\/","title":{"rendered":"\u958b\u767a\u306e\u6d77\u3092\u822a\u884c\u3059\u308b\uff1aIT\u30b7\u30b9\u30c6\u30e0\u306b\u304a\u3051\u308b\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\u56f3\u3001\u30b7\u30fc\u30b1\u30f3\u30b9\u56f3\u3001\u30a2\u30af\u30c6\u30a3\u30d3\u30c6\u30a3\u56f3\u306e\u6d3b\u7528\u306b\u95a2\u3059\u308b\u5305\u62ec\u7684\u30ac\u30a4\u30c9"},"content":{"rendered":"<h2><strong>\u306f\u3058\u3081\u306b<\/strong><\/h2>\n<p>IT\u30b7\u30b9\u30c6\u30e0\u306e\u958b\u767a\u3068\u3044\u3046\u65c5\u306b\u4e57\u308a\u51fa\u3059\u306b\u306f\u3001\u8a2d\u8a08\u3068\u6a5f\u80fd\u306e\u8907\u96d1\u3055\u3092\u4e57\u308a\u8d8a\u3048\u308b\u305f\u3081\u306e\u660e\u78ba\u306a\u30ed\u30fc\u30c9\u30de\u30c3\u30d7\u304c\u5fc5\u8981\u3067\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u4ee5\u4e0b\u306e3\u3064\u306e\u5f37\u529b\u306a\u30c4\u30fc\u30eb\u3092\u7528\u3044\u3066\u3001\u30b7\u30b9\u30c6\u30e0\u958b\u767a\u306e\u6280\u8853\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u63a2\u6c42\u3057\u307e\u3059\u3002<a href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-uml\/\">UML<\/a>:<\/p>\n<ul>\n<li><a href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-use-case-diagram\/\">\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\u56f3<\/a>,<\/li>\n<li><a href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-sequence-diagram\/\">\u30b7\u30fc\u30b1\u30f3\u30b9\u56f3<\/a>\u3001\u304a\u3088\u3073<\/li>\n<li><a href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-activity-diagram\/\">\u30a2\u30af\u30c6\u30a3\u30d3\u30c6\u30a3\u56f3<\/a>.<\/li>\n<\/ul>\n<p>\u7c21\u5358\u3060\u304c\u8aac\u660e\u7684\u3067\u3042\u308b\u30aa\u30f3\u30e9\u30a4\u30f3\u30b7\u30e7\u30c3\u30d4\u30f3\u30b0\u30b7\u30b9\u30c6\u30e0\u306e\u69cb\u7bc9\u3068\u3044\u3046\u8996\u70b9\u304b\u3089\u3001\u30d7\u30ed\u30bb\u30b9\u3092\u89e3\u304d\u660e\u304b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p><img alt=\"Free UML Tool\" decoding=\"async\" src=\"https:\/\/guides.visual-paradigm.com\/wp-content\/uploads\/2023\/10\/05-use-case-diagram.png\"\/><\/p>\n<h2><strong>\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\u56f3\uff1a<\/strong><\/h2>\n<p>\u300c<a href=\"https:\/\/online.visual-paradigm.com\/diagrams\/tutorials\/use-case-diagram-tutorial\/\">\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\u56f3<\/a>\u300d\u3067\u306f\u3001\u7570\u306a\u308b\u30a2\u30af\u30bf\u30fc\u3068\u305d\u308c\u3089\u304c\u30b7\u30b9\u30c6\u30e0\u3068\u884c\u3046\u76f8\u4e92\u4f5c\u7528\u3092\u7279\u5b9a\u3057\u307e\u3059\u3002\u30a2\u30af\u30bf\u30fc\u3068\u306f\u3001\u30b7\u30b9\u30c6\u30e0\u3068\u3084\u308a\u53d6\u308a\u3059\u308b\u5916\u90e8\u306e\u5b9f\u4f53\u3067\u3059\u3002\u30aa\u30f3\u30e9\u30a4\u30f3\u30b7\u30e7\u30c3\u30d4\u30f3\u30b0\u30b7\u30b9\u30c6\u30e0\u306e\u5834\u5408\u3001\u30a2\u30af\u30bf\u30fc\u306b\u306f\u300c\u9867\u5ba2\u300d\u3001\u300c\u7ba1\u7406\u8005\u300d\u3001\u300c\u30b7\u30b9\u30c6\u30e0\u300d\u306a\u3069\u304c\u542b\u307e\u308c\u307e\u3059\u3002<\/p>\n<ul>\n<li><strong>\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\uff1a<\/strong>\n<ul>\n<li>\u9867\u5ba2\uff1a\n<ul>\n<li>\u5546\u54c1\u3092\u691c\u7d22\u3059\u308b<\/li>\n<li>\u5546\u54c1\u3092\u30b7\u30e7\u30c3\u30d4\u30f3\u30b0\u30ab\u30fc\u30c8\u306b\u8ffd\u52a0\u3059\u308b<\/li>\n<li>\u30c1\u30a7\u30c3\u30af\u30a2\u30a6\u30c8\u3078\u9032\u3080<\/li>\n<li>\u652f\u6255\u3044\u3092\u884c\u3046<\/li>\n<\/ul>\n<\/li>\n<li>\u7ba1\u7406\u8005\uff1a\n<ul>\n<li>\u5546\u54c1\u306e\u8ffd\u52a0\uff0f\u524a\u9664<\/li>\n<li>\u9867\u5ba2\u306e\u6ce8\u6587\u3092\u7ba1\u7406\u3059\u308b<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2><strong>\u30b7\u30fc\u30b1\u30f3\u30b9\u56f3\uff1a<\/strong><\/h2>\n<p>\u305d\u308c\u3067\u306f\u3001<a href=\"https:\/\/online.visual-paradigm.com\/diagrams\/tutorials\/sequence-diagram-tutorial\/\">\u30b7\u30fc\u30b1\u30f3\u30b9\u56f3<\/a>\u3092\u4f5c\u6210\u3057\u3066\u3001\u3053\u308c\u3089\u306e\u30a2\u30af\u30bf\u30fc\u9593\u306e\u76f8\u4e92\u4f5c\u7528\u3092\u793a\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<ul>\n<li><strong>\u9867\u5ba2\u306e\u30b7\u30fc\u30b1\u30f3\u30b9\uff1a<\/strong>\n<ol>\n<li>\u9867\u5ba2\u304c\u30ed\u30b0\u30a4\u30f3\u3059\u308b\u3002<\/li>\n<li>\u88fd\u54c1\u3092\u691c\u7d22\u3059\u308b\u3002<\/li>\n<li>\u8a73\u7d30\u3092\u8868\u793a\u3059\u308b\u88fd\u54c1\u3092\u9078\u629e\u3059\u308b\u3002<\/li>\n<li>\u88fd\u54c1\u3092\u30b7\u30e7\u30c3\u30d4\u30f3\u30b0\u30ab\u30fc\u30c8\u306b\u8ffd\u52a0\u3059\u308b\u3002<\/li>\n<li>\u30c1\u30a7\u30c3\u30af\u30a2\u30a6\u30c8\u3078\u9032\u3080\u3002<\/li>\n<li>\u652f\u6255\u3044\u3092\u884c\u3046\u3002<\/li>\n<\/ol>\n<\/li>\n<li><strong>\u7ba1\u7406\u8005\u306e\u624b\u9806\uff1a<\/strong>\n<ol>\n<li>\u7ba1\u7406\u8005\u304c\u30ed\u30b0\u30a4\u30f3\u3059\u308b\u3002<\/li>\n<li>\u30ab\u30bf\u30ed\u30b0\u306b\u65b0\u3057\u3044\u88fd\u54c1\u3092\u8ffd\u52a0\u3059\u308b\u3002<\/li>\n<li>\u65e2\u5b58\u306e\u88fd\u54c1\u3092\u524a\u9664\u3059\u308b\u3002<\/li>\n<li>\u9867\u5ba2\u306e\u6ce8\u6587\u3092\u7ba1\u7406\u3059\u308b\u3002<\/li>\n<\/ol>\n<\/li>\n<\/ul>\n<h2><strong>\u30a2\u30af\u30c6\u30a3\u30d3\u30c6\u30a3\u56f3\uff1a<\/strong><\/h2>\n<p>\u6b21\u306b\u3001<a href=\"https:\/\/online.visual-paradigm.com\/diagrams\/tutorials\/activity-diagram-tutorial\/\">\u30a2\u30af\u30c6\u30a3\u30d3\u30c6\u30a3\u56f3<\/a>\u306f\u5404\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\u5185\u306e\u6d3b\u52d5\u306e\u6d41\u308c\u3092\u8868\u3059\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/p>\n<ul>\n<li><strong>\u9867\u5ba2\u306e\u6d3b\u52d5\uff1a<\/strong>\n<ul>\n<li>\u958b\u59cb<\/li>\n<li>\u30ed\u30b0\u30a4\u30f3<\/li>\n<li>\u88fd\u54c1\u3092\u691c\u7d22\u3059\u308b<\/li>\n<li>\u88fd\u54c1\u3092\u9078\u629e\u3059\u308b<\/li>\n<li>\u30ab\u30fc\u30c8\u306b\u8ffd\u52a0\u3059\u308b<\/li>\n<li>\u30c1\u30a7\u30c3\u30af\u30a2\u30a6\u30c8<\/li>\n<li>\u652f\u6255\u3044\u3092\u884c\u3046<\/li>\n<li>\u7d42\u4e86<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u7ba1\u7406\u8005\u306e\u6d3b\u52d5\uff1a<\/strong>\n<ul>\n<li>\u958b\u59cb<\/li>\n<li>\u30ed\u30b0\u30a4\u30f3<\/li>\n<li>\u88fd\u54c1\u3092\u8ffd\u52a0\u3059\u308b<\/li>\n<li>\u88fd\u54c1\u3092\u524a\u9664\u3059\u308b<\/li>\n<li>\u6ce8\u6587\u3092\u7ba1\u7406\u3059\u308b<\/li>\n<li>\u7d42\u4e86<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>\u3053\u308c\u3089\u306e\u56f3\u3092\u63cf\u304f\u3053\u3068\u3067\u3001\u30b7\u30b9\u30c6\u30e0\u306e\u6a5f\u80fd\u3001\u30e6\u30fc\u30b6\u30fc\u3068\u306e\u76f8\u4e92\u4f5c\u7528\u3001\u30b7\u30b9\u30c6\u30e0\u306e\u30d7\u30ed\u30bb\u30b9\u3092\u8996\u899a\u7684\u306b\u8868\u73fe\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u5b9f\u969b\u306e\u5b9f\u88c5\u524d\u306b\u30b7\u30b9\u30c6\u30e0\u8a2d\u8a08\u306e\u7406\u89e3\u3001\u5171\u6709\u3001\u6539\u5584\u304c\u5bb9\u6613\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u3089\u306e\u56f3\u306f\u53cd\u5fa9\u7684\u3067\u3042\u308a\u3001\u958b\u767a\u30d7\u30ed\u30bb\u30b9\u306e\u9032\u884c\u3084\u65b0\u3057\u3044\u8981\u4ef6\u306e\u51fa\u73fe\u306b\u5fdc\u3058\u3066\u5909\u66f4\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3053\u3068\u3092\u899a\u3048\u3066\u304a\u3044\u3066\u304f\u3060\u3055\u3044\u3002\u958b\u767a\u30c1\u30fc\u30e0\u5185\u3067\u306e\u8cb4\u91cd\u306a\u6587\u66f8\u5316\u304a\u3088\u3073\u30b3\u30df\u30e5\u30cb\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u624b\u6bb5\u3068\u3057\u3066\u6a5f\u80fd\u3057\u307e\u3059\u3002<\/p>\n<h2><strong>\u8981\u7d04<\/strong><\/h2>\n<p>Use Case Diagrams\u304c\u63d0\u4f9b\u3059\u308b\u4fef\u77b0\u7684\u306a\u8996\u70b9\u304b\u3089\u3001\u30a2\u30af\u30bf\u30fc\u3068\u305d\u306e\u76f8\u4e92\u4f5c\u7528\u3092\u8a73\u7d30\u306b\u793a\u3057\u3001Sequence Diagrams\u306b\u304a\u3051\u308b\u8907\u96d1\u306a\u30b7\u30fc\u30b1\u30f3\u30b9\u306e\u52d5\u304d\u3001\u305d\u3057\u3066Activity 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\u88fd\u54c1\u3092\u524a\u9664\u3059\u308b \u6ce8\u6587\u3092\u7ba1\u7406\u3059\u308b \u7d42\u4e86 \u3053\u308c\u3089\u306e\u56f3\u3092\u63cf\u304f\u3053\u3068\u3067\u3001\u30b7\u30b9\u30c6\u30e0\u306e\u6a5f\u80fd\u3001\u30e6\u30fc\u30b6\u30fc\u3068\u306e\u76f8\u4e92\u4f5c\u7528\u3001\u30b7\u30b9\u30c6\u30e0\u306e\u30d7\u30ed\u30bb\u30b9\u3092\u8996\u899a\u7684\u306b\u8868\u73fe\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u5b9f\u969b\u306e\u5b9f\u88c5\u524d\u306b\u30b7\u30b9\u30c6\u30e0\u8a2d\u8a08\u306e\u7406\u89e3\u3001\u5171\u6709\u3001\u6539\u5584\u304c\u5bb9\u6613\u306b\u306a\u308a\u307e\u3059\u3002 \u3053\u308c\u3089\u306e\u56f3\u306f\u53cd\u5fa9\u7684\u3067\u3042\u308a\u3001\u958b\u767a\u30d7\u30ed\u30bb\u30b9\u306e\u9032\u884c\u3084\u65b0\u3057\u3044\u8981\u4ef6\u306e\u51fa\u73fe\u306b\u5fdc\u3058\u3066\u5909\u66f4\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3053\u3068\u3092\u899a\u3048\u3066\u304a\u3044\u3066\u304f\u3060\u3055\u3044\u3002\u958b\u767a\u30c1\u30fc\u30e0\u5185\u3067\u306e\u8cb4\u91cd\u306a\u6587\u66f8\u5316\u304a\u3088\u3073\u30b3\u30df\u30e5\u30cb\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u624b\u6bb5\u3068\u3057\u3066\u6a5f\u80fd\u3057\u307e\u3059\u3002 \u8981\u7d04 Use Case Diagrams\u304c\u63d0\u4f9b\u3059\u308b\u4fef\u77b0\u7684\u306a\u8996\u70b9\u304b\u3089\u3001\u30a2\u30af\u30bf\u30fc\u3068\u305d\u306e\u76f8\u4e92\u4f5c\u7528\u3092\u8a73\u7d30\u306b\u793a\u3057\u3001Sequence Diagr<a href=\"https:\/\/guides.visual-paradigm.com\/ja\/navigating-the-development-seas-a-comprehensive-guide-to-using-use-case-sequence-and-activity-diagrams-in-it-systems\/\" 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