{"id":4142,"date":"2026-03-27T02:16:59","date_gmt":"2026-03-27T02:16:59","guid":{"rendered":"https:\/\/www.diagrams-ai.com\/ja\/dfd-explained-simply-beginners-guide\/"},"modified":"2026-03-27T02:16:59","modified_gmt":"2026-03-27T02:16:59","slug":"dfd-explained-simply-beginners-guide","status":"publish","type":"post","link":"https:\/\/www.diagrams-ai.com\/ja\/dfd-explained-simply-beginners-guide\/","title":{"rendered":"DFD\u3092\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\uff1a\u30c7\u30fc\u30bf\u30d5\u30ed\u30fc\u30c0\u30a4\u30a2\u30b0\u30e9\u30e0\u5165\u9580\u30ac\u30a4\u30c9"},"content":{"rendered":"<p>\u30c7\u30fc\u30bf\u30d5\u30ed\u30fc\u30c0\u30a4\u30a2\u30b0\u30e9\u30e0\uff08DFD\uff09\u306f\u3001\u60c5\u5831\u304c\u30b7\u30b9\u30c6\u30e0\u5185\u3067\u3069\u306e\u3088\u3046\u306b\u79fb\u52d5\u3059\u308b\u304b\u3092\u53ef\u8996\u5316\u3059\u308b\u305f\u3081\u306e\u5fc5\u9808\u30c4\u30fc\u30eb\u3067\u3059\u3002\u65b0\u3057\u3044\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u8a2d\u8a08\u3001\u30d3\u30b8\u30cd\u30b9\u30d7\u30ed\u30bb\u30b9\u306e\u30de\u30c3\u30d4\u30f3\u30b0\u3001\u307e\u305f\u306f\u65e2\u5b58\u306e\u30ef\u30fc\u30af\u30d5\u30ed\u30fc\u306e\u5206\u6790\u3092\u884c\u3046\u5834\u5408\u3001\u30c7\u30fc\u30bf\u306e\u6d41\u308c\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u306f\u4e0d\u53ef\u6b20\u3067\u3059\u3002\u3053\u306e\u30ac\u30a4\u30c9\u3067\u306f\u3001DFD\u306e\u6982\u5ff5\u3092\u6271\u3044\u3084\u3059\u3044\u90e8\u5206\u306b\u5206\u89e3\u3057\u3001\u660e\u78ba\u3055\u3068\u5b9f\u7528\u7684\u306a\u5fdc\u7528\u306b\u7126\u70b9\u3092\u5f53\u3066\u307e\u3059\u3002<\/p>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img alt=\"Hand-drawn infographic explaining Data Flow Diagrams (DFDs) for beginners: visual guide covering the four core components (external entities, processes, data stores, data flows), hierarchical DFD levels (Context\/Level 0, Level 1, Level 2+), notation style comparison (Yourdon &amp; DeMarco vs Gane &amp; Sarson), step-by-step creation process, common pitfalls to avoid, and key benefits for system design, communication, and requirement analysis\" decoding=\"async\" src=\"https:\/\/www.diagrams-ai.com\/wp-content\/uploads\/2026\/03\/data-flow-diagram-dfd-beginner-guide-infographic-hand-drawn.jpg\"\/><\/figure>\n<\/div>\n<h2>\ud83e\uddd0 \u305d\u3082\u305d\u3082\u30c7\u30fc\u30bf\u30d5\u30ed\u30fc\u30c0\u30a4\u30a2\u30b0\u30e9\u30e0\u3068\u306f\u4f55\u304b\uff1f<\/h2>\n<p>\u30c7\u30fc\u30bf\u30d5\u30ed\u30fc\u30c0\u30a4\u30a2\u30b0\u30e9\u30e0\u3068\u306f\u3001\u60c5\u5831\u30b7\u30b9\u30c6\u30e0\u5185\u3092\u6d41\u308c\u3066\u3044\u308b\u30c7\u30fc\u30bf\u306e\u6d41\u308c\u3092\u56f3\u5f0f\u5316\u3057\u305f\u3082\u306e\u3067\u3042\u308b\u3002\u30d5\u30ed\u30fc\u30c1\u30e3\u30fc\u30c8\u3068\u306f\u7570\u306a\u308a\u3001\u30d5\u30ed\u30fc\u30c1\u30e3\u30fc\u30c8\u306f\u5236\u5fa1\u8ad6\u7406\u3084\u5224\u65ad\u30dd\u30a4\u30f3\u30c8\u306b\u6ce8\u76ee\u3059\u308b\u304c\u3001DFD\u306f\u5165\u529b\u5143\u304b\u3089\u51fa\u529b\u5148\u3078\u3068\u30c7\u30fc\u30bf\u304c\u3069\u306e\u3088\u3046\u306b\u79fb\u52d5\u3059\u308b\u304b\u306b\u6ce8\u76ee\u3059\u308b\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30b9\u30c6\u30fc\u30af\u30db\u30eb\u30c0\u30fc\u306f\u5fc5\u8981\u306a\u30c7\u30fc\u30bf\u3001\u305d\u306e\u51fa\u6240\u3001\u51e6\u7406\u65b9\u6cd5\u3001\u6700\u7d42\u7684\u306a\u5230\u7740\u5730\u70b9\u3092\u7406\u89e3\u3067\u304d\u308b\u3002<\/p>\n<p>DFD\u3092\u30b7\u30b9\u30c6\u30e0\u306e\u60c5\u5831\u306e\u5730\u56f3\u3068\u8003\u3048\u3066\u304f\u3060\u3055\u3044\u3002\u7dda\u5f62\u7684\u306a\u30bf\u30a4\u30df\u30f3\u30b0\u3084\u51fa\u6765\u4e8b\u306e\u9806\u5e8f\u3092\u793a\u3059\u306e\u3067\u306f\u306a\u304f\u3001\u30c7\u30fc\u30bf\u306e\u63a5\u7d9a\u6027\u3068\u5909\u63db\u3092\u793a\u3057\u307e\u3059\u3002\u3053\u306e\u305f\u3081\u3001\u8981\u4ef6\u53ce\u96c6\u6bb5\u968e\u306b\u304a\u3044\u3066\u30b7\u30b9\u30c6\u30e0\u30a2\u30ca\u30ea\u30b9\u30c8\u3084\u958b\u767a\u8005\u306b\u3068\u3063\u3066\u7279\u306b\u6709\u7528\u3067\u3059\u3002<\/p>\n<h2>\ud83e\udde9 4\u3064\u306e\u6838\u5fc3\u7684\u306a\u69cb\u6210\u8981\u7d20<\/h2>\n<p>\u6709\u52b9\u306aDFD\u3092\u69cb\u7bc9\u3059\u308b\u306b\u306f\u30014\u3064\u306e\u57fa\u672c\u7684\u306a\u69cb\u6210\u8981\u7d20\u3092\u7406\u89e3\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u3059\u3079\u3066\u306e\u56f3\u306f\u3053\u308c\u3089\u306e\u8981\u7d20\u3092\u4f7f\u3063\u3066\u69cb\u6210\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u3089\u3092\u6b63\u3057\u304f\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u56f3\u304c\u30b7\u30b9\u30c6\u30e0\u306e\u8ad6\u7406\u3092\u6b63\u78ba\u306b\u53cd\u6620\u3057\u3066\u3044\u308b\u3053\u3068\u3092\u4fdd\u8a3c\u3067\u304d\u307e\u3059\u3002<\/p>\n<ul>\n<li><strong>\u5916\u90e8\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3<\/strong>\uff08\u307e\u305f\u306f\u30bf\u30fc\u30df\u30cd\u30fc\u30bf\uff09\uff1a\u3053\u308c\u3089\u306f\u30b7\u30b9\u30c6\u30e0\u5883\u754c\u5916\u306e\u30c7\u30fc\u30bf\u306e\u767a\u751f\u6e90\u307e\u305f\u306f\u5230\u7740\u5730\u3092\u8868\u3057\u307e\u3059\u3002\u30e6\u30fc\u30b6\u30fc\u3001\u4ed6\u306e\u30b7\u30b9\u30c6\u30e0\u3001\u7d44\u7e54\u306a\u3069\u304c\u4f8b\u3067\u3059\u3002\u3053\u308c\u3089\u306f\u30c7\u30fc\u30bf\u30d5\u30ed\u30fc\u306e\u958b\u59cb\u70b9\u307e\u305f\u306f\u7d42\u4e86\u70b9\u3067\u3059\u3002<\/li>\n<li><strong>\u30d7\u30ed\u30bb\u30b9<\/strong>\uff1a\u3053\u308c\u3089\u306f\u5165\u529b\u30c7\u30fc\u30bf\u3092\u51fa\u529b\u30c7\u30fc\u30bf\u306b\u5909\u63db\u3059\u308b\u30a2\u30af\u30b7\u30e7\u30f3\u3067\u3059\u3002\u30d7\u30ed\u30bb\u30b9\u306f\u3001\u5408\u8a08\u3092\u8a08\u7b97\u3059\u308b\u3001\u5165\u529b\u5024\u3092\u691c\u8a3c\u3059\u308b\u3001\u30ea\u30b9\u30c8\u3092\u4e26\u3079\u66ff\u3048\u308b\u306a\u3069\u3001\u30c7\u30fc\u30bf\u3092\u3042\u308b\u5f62\u3067\u5909\u66f4\u3057\u307e\u3059\u3002\u5404\u30d7\u30ed\u30bb\u30b9\u306b\u306f\u3001\u305d\u306e\u30a2\u30af\u30b7\u30e7\u30f3\u3092\u8aac\u660e\u3059\u308b\u540d\u524d\u304c\u5fc5\u8981\u3067\u3059\u3002<\/li>\n<li><strong>\u30c7\u30fc\u30bf\u30b9\u30c8\u30a2<\/strong>\uff1a\u3053\u308c\u3089\u306f\u5f8c\u3067\u4f7f\u7528\u3059\u308b\u305f\u3081\u306b\u30c7\u30fc\u30bf\u3092\u4fdd\u6301\u3059\u308b\u30ea\u30dd\u30b8\u30c8\u30ea\u3067\u3059\u3002\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3001\u30d5\u30a1\u30a4\u30eb\u3001\u307e\u305f\u306f\u60c5\u5831\u304c\u4fdd\u5b58\u3055\u308c\u308b\u5834\u6240\u3092\u8868\u3057\u307e\u3059\u3002\u30c7\u30fc\u30bf\u306f\u30b9\u30c8\u30a2\u306b\u6d41\u5165\u3057\u3066\u8a18\u9332\u3055\u308c\u3001\u30b9\u30c8\u30a2\u304b\u3089\u6d41\u51fa\u3057\u3066\u53d6\u5f97\u3055\u308c\u307e\u3059\u3002<\/li>\n<li><strong>\u30c7\u30fc\u30bf\u30d5\u30ed\u30fc<\/strong>\uff1a\u3053\u308c\u3089\u306f\u30c7\u30fc\u30bf\u306e\u79fb\u52d5\u65b9\u5411\u3092\u793a\u3059\u77e2\u5370\u3067\u3059\u3002\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3001\u30d7\u30ed\u30bb\u30b9\u3001\u30b9\u30c8\u30a2\u3092\u3064\u306a\u304e\u307e\u3059\u3002\u3059\u3079\u3066\u306e\u30d5\u30ed\u30fc\u306b\u306f\u3001\u79fb\u52d5\u4e2d\u306e\u7279\u5b9a\u306e\u30c7\u30fc\u30bf\u3092\u8aac\u660e\u3059\u308b\u30e9\u30d9\u30eb\u304c\u5fc5\u8981\u3067\u3059\u3002<\/li>\n<\/ul>\n<p>\u30c7\u30fc\u30bf\u304c\u5358\u306b\u51fa\u73fe\u3057\u305f\u308a\u6d88\u3048\u305f\u308a\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u306a\u3044\u3053\u3068\u306b\u6ce8\u610f\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002\u3059\u3079\u3066\u306e\u5165\u529b\u306f\u51fa\u529b\u306b\u7d50\u3073\u3064\u3044\u305f\u308a\u3001\u4fdd\u5b58\u3055\u308c\u305f\u308a\u3057\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002\u3053\u306e\u539f\u5247\u306f\u300c\u30c7\u30fc\u30bf\u306e\u4fdd\u5b58\u5247\u300d\u3068\u547c\u3070\u308c\u307e\u3059\u3002<\/p>\n<h2>\ud83d\udcc9 DFD\u306e\u30ec\u30d9\u30eb\u3092\u7406\u89e3\u3059\u308b<\/h2>\n<p>DFD\u306f\u968e\u5c64\u7684\u3067\u3059\u3002\u9ad8\u30ec\u30d9\u30eb\u306e\u8996\u70b9\u304b\u3089\u59cb\u3081\u3001\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u3088\u308a\u8a73\u7d30\u306a\u30d3\u30e5\u30fc\u306b\u5206\u89e3\u3057\u3066\u3044\u304d\u307e\u3059\u3002\u3053\u306e\u624b\u6cd5\u306b\u3088\u308a\u3001\u8a73\u7d30\u3092\u5fc5\u8981\u3068\u3059\u308b\u307e\u3067\u96a0\u3059\u3053\u3068\u3067\u3001\u8907\u96d1\u3055\u3092\u7ba1\u7406\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3>1. \u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u56f3\uff08\u30ec\u30d9\u30eb0\uff09<\/h3>\n<p>\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u56f3\u306f\u3001\u6700\u3082\u9ad8\u3044\u62bd\u8c61\u5ea6\u306e\u30ec\u30d9\u30eb\u3067\u3059\u3002\u30b7\u30b9\u30c6\u30e0\u3092\u5358\u4e00\u306e\u30d7\u30ed\u30bb\u30b9\u3068\u3057\u3066\u793a\u3057\u3001\u5916\u90e8\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3068\u306e\u76f8\u4e92\u4f5c\u7528\u3092\u8868\u3057\u307e\u3059\u3002\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u56f3\u306b\u306f\u30c7\u30fc\u30bf\u30b9\u30c8\u30a2\u304c\u5b58\u5728\u3057\u307e\u305b\u3093\u3002\u3053\u306e\u56f3\u306f\u3001\u300c\u3053\u306e\u30b7\u30b9\u30c6\u30e0\u306e\u4e3b\u306a\u6a5f\u80fd\u306f\u4f55\u3067\u3059\u304b\uff1f\u300d\u3068\u3044\u3046\u554f\u3044\u306b\u7b54\u3048\u308b\u3082\u306e\u3067\u3059\u3002<\/p>\n<ul>\n<li>\u30b7\u30b9\u30c6\u30e0\u5168\u4f53\u3092\u8868\u3059\u4e2d\u5fc3\u7684\u306a\u30d7\u30ed\u30bb\u30b9\u3002<\/li>\n<li>\u305d\u308c\u3092\u53d6\u308a\u56f2\u3080\u3059\u3079\u3066\u306e\u5916\u90e8\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3002<\/li>\n<li>\u30b7\u30b9\u30c6\u30e0\u306b\u5165\u308a\u51fa\u3057\u3059\u308b\u4e3b\u8981\u306a\u30c7\u30fc\u30bf\u30d5\u30ed\u30fc\u3002<\/li>\n<\/ul>\n<h3>2. \u30ec\u30d9\u30eb1\u56f3<\/h3>\n<p>\u30ec\u30d9\u30eb1\u56f3\u306f\u3001\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u56f3\u306e\u5358\u4e00\u30d7\u30ed\u30bb\u30b9\u3092\u4e3b\u8981\u306a\u30b5\u30d6\u30d7\u30ed\u30bb\u30b9\u306b\u5206\u89e3\u3057\u307e\u3059\u3002\u3053\u3053\u304b\u3089\u5185\u90e8\u69cb\u9020\u304c\u898b\u3048\u3066\u304d\u307e\u3059\u3002\u30c7\u30fc\u30bf\u30b9\u30c8\u30a2\u3084\u3088\u308a\u5177\u4f53\u7684\u306a\u30c7\u30fc\u30bf\u30d5\u30ed\u30fc\u304c\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u30b7\u30b9\u30c6\u30e0\u3092\u7a3c\u50cd\u3055\u305b\u308b\u305f\u3081\u306b\u5fc5\u8981\u306a\u4e3b\u8981\u306a\u6a5f\u80fd\u3092\u793a\u3059\u3002<\/li>\n<li>\u30c7\u30fc\u30bf\u304c\u5185\u90e8\u3067\u3069\u3053\u306b\u4fdd\u5b58\u3055\u308c\u3066\u3044\u308b\u304b\u3092\u7279\u5b9a\u3059\u308b\u3002<\/li>\n<li>\u5916\u90e8\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3092\u7279\u5b9a\u306e\u30d7\u30ed\u30bb\u30b9\u306b\u63a5\u7d9a\u3059\u308b\u3002<\/li>\n<\/ul>\n<h3>3. \u30ec\u30d9\u30eb2\u56f3\u304a\u3088\u3073\u305d\u308c\u4ee5\u4e0a\u306e\u30ec\u30d9\u30eb<\/h3>\n<p>\u30ec\u30d9\u30eb1\u56f3\u306e\u30d7\u30ed\u30bb\u30b9\u304c\u8907\u96d1\u3059\u304e\u308b\u5834\u5408\u306f\u3001\u3055\u3089\u306b\u30ec\u30d9\u30eb2\u56f3\u306b\u5206\u89e3\u3067\u304d\u307e\u3059\u3002\u3053\u306e\u8a73\u7d30\u5316\u306f\u3001\u30d7\u30ed\u30bb\u30b9\u304c\u5b9f\u88c5\u53ef\u80fd\u306a\u307b\u3069\u5358\u7d14\u306b\u306a\u308b\u307e\u3067\u7d9a\u304d\u307e\u3059\u3002\u901a\u5e38\u3001\u8ad6\u7406\u304c\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3084\u5b9f\u884c\u306b\u5341\u5206\u660e\u78ba\u306b\u306a\u308b\u6642\u70b9\u3067\u505c\u6b62\u3057\u307e\u3059\u3002<\/p>\n<h2>\ud83c\udfa8 \u8868\u8a18\u30b9\u30bf\u30a4\u30eb\u306e\u6bd4\u8f03<\/h2>\n<p>DFD\u3092\u63cf\u304f\u306b\u306f\u4e3b\u306b2\u3064\u306e\u30b9\u30bf\u30a4\u30eb\u304c\u3042\u308a\u307e\u3059\u3002\u540c\u3058\u8ad6\u7406\u7684\u6982\u5ff5\u3092\u8868\u3057\u3066\u3044\u307e\u3059\u304c\u3001\u8a18\u53f7\u306e\u9055\u3044\u304c\u3042\u308a\u307e\u3059\u3002\u9069\u5207\u306a\u8868\u8a18\u3092\u9078\u3076\u306b\u306f\u3001\u30c1\u30fc\u30e0\u306e\u597d\u307f\u3084\u696d\u754c\u306e\u6a19\u6e96\u306b\u5f93\u3046\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<table>\n<thead>\n<tr>\n<th>\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8<\/th>\n<th>Yourdon &amp; DeMarco<\/th>\n<th>Gane &amp; Sarson<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u30d7\u30ed\u30bb\u30b9<\/td>\n<td>\u89d2\u304c\u4e38\u3044\u9577\u65b9\u5f62<\/td>\n<td>\u89d2\u304c\u4e38\u3044\u9577\u65b9\u5f62<\/td>\n<\/tr>\n<tr>\n<td>\u30c7\u30fc\u30bf\u30b9\u30c8\u30a2<\/td>\n<td>\u958b\u3044\u305f\u9577\u65b9\u5f62<\/td>\n<td>\u4e00\u65b9\u306e\u8fba\u304c\u958b\u3044\u305f\u9577\u65b9\u5f62<\/td>\n<\/tr>\n<tr>\n<td>\u5916\u90e8\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3<\/td>\n<td>\u9577\u65b9\u5f62<\/td>\n<td>\u9577\u65b9\u5f62<\/td>\n<\/tr>\n<tr>\n<td>\u30c7\u30fc\u30bf\u30d5\u30ed\u30fc<\/td>\n<td>\u66f2\u304c\u3063\u305f\u77e2\u5370<\/td>\n<td>\u76f4\u7dda\u77e2\u5370<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u4e21\u65b9\u306e\u8868\u8a18\u306f\u6709\u52b9\u3067\u3059\u3002\u91cd\u8981\u306a\u306e\u306f\u4e00\u8cab\u6027\u3067\u3059\u3002\u30c1\u30fc\u30e0\u304cGane &amp; Sarson\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u5834\u5408\u3001\u3059\u3079\u3066\u306e\u56f3\u3067\u305d\u308c\u3092\u4f7f\u7528\u3057\u7d9a\u3051\u308b\u3079\u304d\u3067\u3059\u3002\u8868\u8a18\u3092\u6df7\u5728\u3055\u305b\u308b\u3068\u8aad\u8005\u304c\u6df7\u4e71\u3057\u3001\u56f3\u306e\u610f\u5473\u304c\u4e0d\u660e\u77ad\u306b\u306a\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h2>\ud83d\udee0\ufe0f 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