{"id":946,"date":"2026-03-22T02:42:09","date_gmt":"2026-03-22T02:42:09","guid":{"rendered":"https:\/\/www.visualize-ai.com\/ja\/using-data-flow-diagrams-for-refactoring\/"},"modified":"2026-03-22T02:42:09","modified_gmt":"2026-03-22T02:42:09","slug":"using-data-flow-diagrams-for-refactoring","status":"publish","type":"post","link":"https:\/\/www.visualize-ai.com\/ja\/using-data-flow-diagrams-for-refactoring\/","title":{"rendered":"DFD\u30ac\u30a4\u30c9\uff1a\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u306b\u304a\u3051\u308b\u30c7\u30fc\u30bf\u30d5\u30ed\u30fc\u30c0\u30a4\u30a2\u30b0\u30e9\u30e0\u306e\u6d3b\u7528"},"content":{"rendered":"<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img alt=\"Comic book style infographic illustrating how Data Flow Diagrams guide code refactoring: showing As-Is vs To-Be system states, common issues like high coupling and data redundancy, and key benefits including visualization of complexity and process decomposition\" 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\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3068\u3084\u308a\u53d6\u308a\u3059\u308b\u3059\u3079\u3066\u306e\u30e6\u30fc\u30b6\u30fc\u304a\u3088\u3073\u30b7\u30b9\u30c6\u30e0\u3092\u30ea\u30b9\u30c8\u30a2\u30c3\u30d7\u3059\u308b\u3002<\/li>\n<li><strong>\u30c7\u30fc\u30bf\u306e\u5165\u529b\u7d4c\u8def\u3092\u8ffd\u8de1\u3059\u308b\uff1a<\/strong> \u30c7\u30fc\u30bf\u304c\u30b7\u30b9\u30c6\u30e0\u306b\u5165\u529b\u3055\u308c\u308b\u65b9\u6cd5\u3068\u3001\u6700\u521d\u306b\u30c7\u30fc\u30bf\u3092\u53d7\u3051\u53d6\u308b\u30d7\u30ed\u30bb\u30b9\u3092\u30de\u30c3\u30d4\u30f3\u30b0\u3059\u308b\u3002<\/li>\n<li><strong>\u51e6\u7406\u30b9\u30c6\u30c3\u30d7\u3092\u30de\u30c3\u30d4\u30f3\u30b0\u3059\u308b\uff1a<\/strong> \u30c7\u30fc\u30bf\u304c\u4e00\u3064\u306e\u30d7\u30ed\u30bb\u30b9\u304b\u3089\u5225\u306e\u30d7\u30ed\u30bb\u30b9\u3078\u3068\u79fb\u52d5\u3059\u308b\u69d8\u5b50\u3092\u77e2\u5370\u3067\u793a\u3059\u3002<\/li>\n<li><strong>\u30c7\u30fc\u30bf\u30b9\u30c8\u30a2\u3092\u7279\u5b9a\u3059\u308b\uff1a<\/strong> \u30d7\u30ed\u30bb\u30b9\u9593\u3067\u60c5\u5831\u304c\u4fdd\u5b58\u3055\u308c\u308b\u5834\u6240\u3092\u30de\u30fc\u30af\u3059\u308b\u3002<\/li>\n<li><strong>\u30c7\u30fc\u30bf\u6574\u5408\u6027\u3092\u691c\u8a3c\u3059\u308b\uff1a<\/strong> \u3059\u3079\u3066\u306e\u30c7\u30fc\u30bf\u30d5\u30ed\u30fc\u304c\u660e\u78ba\u306a\u767a\u4fe1\u5143\u3068\u53d7\u4fe1\u5148\u3092\u6301\u3063\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3059\u308b\u3002<\/li>\n<\/ol>\n<h2>\u975e\u52b9\u7387\u6027\u304a\u3088\u3073\u6b20\u9665\u306e\u7279\u5b9a \ud83d\udd0d<\/h2>\n<p>\u73fe\u72b6\u56f3\u304c\u5b8c\u6210\u3059\u308b\u3068\u3001\u8a3a\u65ad\u30c4\u30fc\u30eb\u3068\u3057\u3066\u6a5f\u80fd\u3059\u308b\u3002\u4eca\u5f8c\u3001\u8a2d\u8a08\u306e\u60aa\u3055\u3092\u793a\u3059\u30d1\u30bf\u30fc\u30f3\u3092\u56f3\u306e\u5206\u6790\u3092\u901a\u3058\u3066\u7279\u5b9a\u3067\u304d\u308b\u3002\u4e00\u822c\u7684\u306a\u5146\u5019\u306b\u306f\u3001\u904e\u5270\u306a\u30c7\u30fc\u30bf\u30d5\u30ed\u30fc\u3001\u5927\u304d\u3059\u304e\u308b\u30d7\u30ed\u30bb\u30b9\u3001\u307e\u305f\u306f\u660e\u78ba\u306a\u7ba1\u7406\u304c\u306a\u304f\u591a\u6570\u306e\u30d7\u30ed\u30bb\u30b9\u306b\u3088\u3063\u3066\u30a2\u30af\u30bb\u30b9\u3055\u308c\u308b\u30c7\u30fc\u30bf\u30b9\u30c8\u30a2\u304c\u3042\u308b\u3053\u3068\u306a\u3069\u304c\u3042\u308b\u3002<\/p>\n<p>\u7d50\u5408\u5ea6\u306e\u6982\u5ff5\u3092\u691c\u8a0e\u3057\u3088\u3046\u30021\u3064\u306e\u30c7\u30fc\u30bf\u30b9\u30c8\u30a2\u306b10\u306e\u7570\u306a\u308b\u30d7\u30ed\u30bb\u30b9\u304c\u66f8\u304d\u8fbc\u307f\u3092\u884c\u3063\u3066\u3044\u308b\u5834\u5408\u3001\u3053\u308c\u306f\u9ad8\u3044\u7d50\u5408\u5ea6\u3092\u793a\u3057\u3066\u3044\u308b\u3002\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u306e\u904e\u7a0b\u3067\u3001\u3053\u306e\u69cb\u9020\u306f\u3057\u3070\u3057\u3070\u5909\u66f4\u304c\u5fc5\u8981\u3068\u306a\u308b\u3002\u66f8\u304d\u8fbc\u307f\u3092\u51e6\u7406\u3059\u308b\u4e2d\u9593\u30d7\u30ed\u30bb\u30b9\u3092\u5c0e\u5165\u3059\u308b\u3001\u307e\u305f\u306f\u30c7\u30fc\u30bf\u3092\u6b63\u898f\u5316\u3057\u3066\u5197\u9577\u6027\u3092\u6e1b\u3089\u3059\u3068\u3044\u3063\u305f\u5bfe\u5fdc\u304c\u8003\u3048\u3089\u308c\u308b\u3002DFD\u306f\u3001\u3053\u3046\u3057\u305f\u554f\u984c\u3092\u5373\u5ea7\u306b\u53ef\u8996\u5316\u3059\u308b\u3002<\/p>\n<p>\u3082\u3046\u4e00\u3064\u306e\u6ce8\u76ee\u30dd\u30a4\u30f3\u30c8\u306f\u300c\u30d6\u30e9\u30c3\u30af\u30db\u30fc\u30eb\u300d\u3067\u3042\u308b\u3002\u3053\u308c\u306f\u3001\u30d7\u30ed\u30bb\u30b9\u304c\u30c7\u30fc\u30bf\u3092\u53d7\u3051\u53d6\u308b\u304c\u3001\u51fa\u529b\u304c\u306a\u3044\u72b6\u614b\u3092\u6307\u3059\u3002\u3053\u308c\u306f\u8ad6\u7406\u7684\u306a\u8aa4\u308a\u3067\u3042\u308a\u3001\u4fee\u6b63\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3002\u9006\u306b\u3001\u300c\u5947\u8de1\u300d\u30d7\u30ed\u30bb\u30b9\u3068\u306f\u3001\u5165\u529b\u304c\u307e\u3063\u305f\u304f\u306a\u3044\u306e\u306b\u30c7\u30fc\u30bf\u3092\u51fa\u529b\u3059\u308b\u30d7\u30ed\u30bb\u30b9\u3092\u6307\u3059\u3002\u4e21\u65b9\u306e\u72b6\u6cc1\u306f\u3001\u30b7\u30b9\u30c6\u30e0\u306e\u8ad6\u7406\u306b\u6b20\u9665\u304c\u3042\u308b\u304b\u3001\u4e0d\u5b8c\u5168\u3067\u3042\u308b\u3053\u3068\u3092\u793a\u5506\u3057\u3066\u3044\u308b\u3002<\/p>\n<p>\u4ee5\u4e0b\u306e\u88681\u306f\u3001\u30ec\u30ac\u30b7\u30fc\u30c7\u30fc\u30bf\u30d5\u30ed\u30fc\u30c0\u30a4\u30a2\u30b0\u30e9\u30e0\u3067\u3088\u304f\u898b\u3089\u308c\u308b\u554f\u984c\u3068\u3001\u305d\u308c\u306b\u5bfe\u3059\u308b\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u306e\u53ef\u80fd\u6027\u3092\u6982\u8aac\u3057\u3066\u3044\u308b\u3002<\/p>\n<table>\n<tbody>\n<tr>\n<th>\u554f\u984c<\/th>\n<th>\u8aac\u660e<\/th>\n<th>\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u306e\u30a2\u30af\u30b7\u30e7\u30f3<\/th>\n<\/tr>\n<tr>\n<td>\u9ad8\u7d50\u5408<\/td>\n<td>1\u3064\u306e\u30d7\u30ed\u30bb\u30b9\u304c\u4ed6\u306e\u591a\u304f\u306e\u30d7\u30ed\u30bb\u30b9\u3068\u76f4\u63a5\u901a\u4fe1\u3059\u308b\u3002<\/td>\n<td>\u30df\u30c9\u30eb\u30a6\u30a7\u30a2\u5c64\u307e\u305f\u306fAPI\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\u3092\u5c0e\u5165\u3059\u308b\u3002<\/td>\n<\/tr>\n<tr>\n<td>\u30c7\u30fc\u30bf\u306e\u91cd\u8907<\/td>\n<td>\u540c\u3058\u30c7\u30fc\u30bf\u304c\u8907\u6570\u306e\u5834\u6240\u306b\u4fdd\u5b58\u3055\u308c\u3066\u3044\u308b\u3002<\/td>\n<td>\u30c7\u30fc\u30bf\u30b9\u30c8\u30a2\u3092\u7d71\u5408\u3057\u3001\u5358\u4e00\u306e\u771f\u5b9f\u306e\u30bd\u30fc\u30b9\u306b\u3059\u308b\u3002<\/td>\n<\/tr>\n<tr>\n<td>\u30d7\u30ed\u30bb\u30b9\u306e\u80a5\u5927\u5316<\/td>\n<td>1\u3064\u306e\u30d7\u30ed\u30bb\u30b9\u304c\u591a\u3059\u304e\u308b\u30b5\u30d6\u30bf\u30b9\u30af\u3092\u51e6\u7406\u3057\u3066\u3044\u308b\u3002<\/td>\n<td>\u3088\u308a\u5c0f\u3055\u306a\u3001\u7126\u70b9\u3092\u7d5e\u3063\u305f\u30d7\u30ed\u30bb\u30b9\u306b\u5206\u89e3\u3059\u308b\u3002<\/td>\n<\/tr>\n<tr>\n<td>\u4e0d\u8981\u306a\u30c7\u30fc\u30bf\u30d5\u30ed\u30fc<\/td>\n<td>\u30c7\u30fc\u30bf\u304c\u30d7\u30ed\u30bb\u30b9\u9593\u3092\u79fb\u52d5\u3059\u308b\u304c\u3001\u4f7f\u7528\u3055\u308c\u306a\u3044\u3002<\/td>\n<td>\u4f7f\u7528\u3055\u308c\u3066\u3044\u306a\u3044\u30c7\u30fc\u30bf\u30d5\u30ed\u30fc\u3068\u4f9d\u5b58\u95a2\u4fc2\u3092\u524a\u9664\u3059\u308b\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u3053\u308c\u3089\u306e\u554f\u984c\u306b\u5bfe\u51e6\u3059\u308b\u306b\u306f\u614e\u91cd\u306a\u8a08\u753b\u304c\u5fc5\u8981\u3067\u3059\u3002\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u304c\u30c7\u30fc\u30bf\u5951\u7d04\u3092\u7834\u58ca\u3057\u306a\u3044\u3053\u3068\u3092\u78ba\u8a8d\u3057\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002DFD\u306f\u3001\u5909\u66f4\u304c\u30b7\u30b9\u30c6\u30e0\u5185\u3067\u3069\u306e\u3088\u3046\u306b\u6ce2\u53ca\u3059\u308b\u304b\u3092\u4e88\u6e2c\u3059\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/p>\n<h2>To-Be\u56f3\u306e\u8a2d\u8a08 \ud83d\ude80<\/h2>\n<p>\u554f\u984c\u3092\u7279\u5b9a\u3057\u305f\u5f8c\u3001To-Be\u56f3\u3092\u8a2d\u8a08\u3057\u307e\u3059\u3002\u3053\u308c\u306f\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u5f8c\u306e\u30b7\u30b9\u30c6\u30e0\u306e\u7406\u60f3\u72b6\u614b\u3092\u8868\u3057\u307e\u3059\u3002\u610f\u56f3\u3059\u308b\u6539\u5584\u3092\u53cd\u6620\u3059\u308b\u3079\u304d\u3067\u3059\u3002\u5197\u9577\u306a\u30d7\u30ed\u30bb\u30b9\u306e\u524a\u9664\u3001\u30c7\u30fc\u30bf\u30b9\u30c8\u30a2\u306e\u7d71\u5408\u3001\u65b0\u3057\u3044\u691c\u8a3c\u30b9\u30c6\u30c3\u30d7\u306e\u5c0e\u5165\u306a\u3069\u304c\u542b\u307e\u308c\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/p>\n<p>To-Be\u72b6\u614b\u3092\u8a2d\u8a08\u3059\u308b\u969b\u306f\u3001\u5916\u90e8\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u4e00\u8cab\u6027\u3092\u6301\u305f\u305b\u308b\u3053\u3068\u3092\u5fc3\u304c\u3051\u3066\u304f\u3060\u3055\u3044\u3002\u30e6\u30fc\u30b6\u30fc\u304a\u3088\u3073\u5916\u90e8\u30b7\u30b9\u30c6\u30e0\u306f\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3068\u306e\u3084\u308a\u53d6\u308a\u306e\u4ed5\u65b9\u304c\u5909\u308f\u3063\u305f\u3053\u3068\u306b\u6c17\u3065\u3044\u3066\u306f\u3044\u3051\u307e\u305b\u3093\u3002\u5909\u5316\u3059\u308b\u306e\u306f\u5185\u90e8\u306e\u30d1\u30b9\u3060\u3051\u3067\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u5f8c\u65b9\u4e92\u63db\u6027\u304c\u4fdd\u305f\u308c\u3001\u6df7\u4e71\u3092\u6700\u5c0f\u9650\u306b\u6291\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u305f\u3068\u3048\u3070\u3001\u30c7\u30fc\u30bf\u51e6\u7406\u3092\u540c\u671f\u51e6\u7406\u304b\u3089\u975e\u540c\u671f\u30ad\u30e5\u30fc\u306b\u79fb\u884c\u3059\u308b\u3068\u6c7a\u3081\u305f\u5834\u5408\u3001DFD\u306f\u5909\u5316\u3057\u307e\u3059\u3002\u30c7\u30fc\u30bf\u30d5\u30ed\u30fc\u306e\u77e2\u5370\u306f\u3001\u76f4\u63a5\u7684\u306a\u30d7\u30ed\u30bb\u30b9\u3067\u306f\u306a\u304f\u30ad\u30e5\u30fc\u306e\u30c7\u30fc\u30bf\u30b9\u30c8\u30a2\u3092\u6307\u3059\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u30e6\u30fc\u30b6\u30fc\u306f\u7d50\u679c\u3092\u540c\u3058\u3088\u3046\u306b\u898b\u307e\u3059\u304c\u3001\u51e6\u7406\u7d4c\u8def\u306f\u5909\u5316\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\u306e\u5909\u66f4\u306f\u3001\u30b9\u30b1\u30fc\u30e9\u30d3\u30ea\u30c6\u30a3\u3092\u5411\u4e0a\u3055\u305b\u308b\u3053\u3068\u304c\u591a\u3044\u3067\u3059\u3002<\/p>\n<p>To-Be\u8a2d\u8a08\u306e\u305f\u3081\u306e\u91cd\u8981\u306a\u539f\u5247\u306b\u306f\u4ee5\u4e0b\u304c\u542b\u307e\u308c\u307e\u3059\uff1a<\/p>\n<ul>\n<li><strong>\u30c7\u30fc\u30bf\u79fb\u52d5\u3092\u6700\u5c0f\u9650\u306b\u6291\u3048\u308b\uff1a<\/strong>\u77e2\u5370\u306e\u6570\u3092\u6e1b\u3089\u3059\u3002\u79fb\u52d5\u304c\u5c11\u306a\u3051\u308c\u3070\u3001\u30aa\u30fc\u30d0\u30fc\u30d8\u30c3\u30c9\u3082\u5c11\u306a\u304f\u306a\u308b\u3002<\/li>\n<li><strong>\u95a2\u5fc3\u306e\u5206\u96e2\uff1a<\/strong>\u5404\u30d7\u30ed\u30bb\u30b9\u304c\u7279\u5b9a\u306e\u30c7\u30fc\u30bf\u30c9\u30e1\u30a4\u30f3\u3092\u51e6\u7406\u3059\u308b\u3053\u3068\u3092\u4fdd\u8a3c\u3059\u308b\u3002<\/li>\n<li><strong>\u30b9\u30c8\u30ec\u30fc\u30b8\u306e\u660e\u78ba\u3055\uff1a<\/strong>\u4e00\u6642\u7684\u306a\u30c7\u30fc\u30bf\u3068\u6c38\u7d9a\u7684\u306a\u30c7\u30fc\u30bf\u3092\u660e\u78ba\u306b\u5b9a\u7fa9\u3059\u308b\u3002<\/li>\n<li><strong>\u30b9\u30b1\u30fc\u30e9\u30d3\u30ea\u30c6\u30a3\uff1a<\/strong>\u56f3\u304c\u69cb\u9020\u7684\u5d29\u58ca\u3092\u4f34\u308f\u305a\u306b\u5c06\u6765\u306e\u6210\u9577\u3092\u30b5\u30dd\u30fc\u30c8\u3059\u308b\u3053\u3068\u3092\u4fdd\u8a3c\u3059\u308b\u3002<\/li>\n<\/ul>\n<h2>\u5909\u66f4\u306e\u30de\u30c3\u30d4\u30f3\u30b0\u3068\u5b9f\u88c5 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