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class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img alt=\"Kawaii-style infographic illustrating common Entity Relationship Diagram pitfalls in agile software development teams, featuring cute characters explaining speed vs structure tension, cardinality errors, normalization balance, technical debt consequences, and best practices for iterative schema evolution, model-driven workflows, and cross-role communication in sprint planning\" decoding=\"async\" src=\"https:\/\/www.viz-read.com\/wp-content\/uploads\/2026\/03\/erd-pitfalls-agile-teams-kawaii-infographic.jpg\"\/><\/figure>\n<\/div>\n<h2>\u30b9\u30d4\u30fc\u30c9\u3068\u69cb\u9020\u306e\u9593\u306e\u7dca\u5f35\u95a2\u4fc2 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\u975e\u6a5f\u80fd\u8981\u4ef6\u306e\u7121\u8996 \ud83d\udcbe<\/h3>\n<p>\u6a5f\u80fd\u8981\u4ef6\u306f\u30b7\u30b9\u30c6\u30e0\u304c\u4f55\u3092\u3059\u308b\u304b\u3092\u898f\u5b9a\u3059\u308b\u3002\u975e\u6a5f\u80fd\u8981\u4ef6\u306f\u305d\u306e\u5b9f\u884c\u306e\u8cea\uff08\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3001\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3001\u53ef\u7528\u6027\uff09\u3092\u898f\u5b9a\u3059\u308b\u3002\u6025\u3044\u3067\u4f5c\u6210\u3055\u308c\u305fERD\u306f\u3057\u3070\u3057\u3070\u3053\u308c\u3089\u306e\u5236\u7d04\u3092\u7121\u8996\u3059\u308b\u3002<\/p>\n<ul>\n<li>\n<p><strong>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u6226\u7565:<\/strong>\u4e00\u822c\u7684\u306a\u30af\u30a8\u30ea\u30d1\u30b9\u306b\u5bfe\u3059\u308b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u8a08\u753b\u3092\u6020\u308b\u3068\u3001\u691c\u7d22\u6642\u9593\u304c\u9045\u304f\u306a\u308b\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u30d1\u30fc\u30c6\u30a3\u30b7\u30e7\u30cb\u30f3\u30b0:<\/strong>\u30c7\u30fc\u30bf\u304c\u5897\u5927\u3059\u308b\u969b\u306b\u3069\u306e\u3088\u3046\u306b\u30d1\u30fc\u30c6\u30a3\u30b7\u30e7\u30cb\u30f3\u30b0\u3055\u308c\u308b\u304b\u3092\u7121\u8996\u3059\u308b\u3053\u3068\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u8ad6\u7406\u524a\u9664:<\/strong>\u76e3\u67fb\u30ed\u30b0\u3084\u5c65\u6b74\u30c7\u30fc\u30bf\u306e\u4fdd\u6301\u304c\u5fc5\u8981\u3067\u3042\u308b\u3053\u3068\u3092\u8003\u616e\u3057\u306a\u3044\u3053\u3068\u3002<\/p>\n<\/li>\n<\/ul>\n<h2>\u30a2\u30b8\u30e3\u30a4\u30eb\u3068\u5f93\u6765\u578b\u30e2\u30c7\u30ea\u30f3\u30b0\u30a2\u30d7\u30ed\u30fc\u30c1\u306e\u6bd4\u8f03 \ud83d\udcca<\/h2>\n<p>\u30ae\u30e3\u30c3\u30d7\u3092\u7406\u89e3\u3059\u308b\u306b\u306f\u3001\u5f93\u6765\u306e\u30a6\u30a9\u30fc\u30bf\u30fc\u30d5\u30a9\u30fc\u30eb\u578b\u30a2\u30d7\u30ed\u30fc\u30c1\u3068\u73fe\u4ee3\u306e\u30a2\u30b8\u30e3\u30a4\u30eb\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u306b\u304a\u3051\u308b\u30c7\u30fc\u30bf\u30e2\u30c7\u30ea\u30f3\u30b0\u306e\u9055\u3044\u3092\u691c\u8a0e\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3002<\/p>\n<table style=\"min-width: 100px;\">\n<colgroup>\n<col style=\"min-width: 25px;\"\/>\n<col style=\"min-width: 25px;\"\/>\n<col style=\"min-width: 25px;\"\/>\n<col style=\"min-width: 25px;\"\/><\/colgroup>\n<tbody>\n<tr>\n<th colspan=\"1\" rowspan=\"1\">\n<p>\u5074\u9762<\/p>\n<\/th>\n<th colspan=\"1\" rowspan=\"1\">\n<p>\u5f93\u6765\u578b\uff08\u30a6\u30a9\u30fc\u30bf\u30fc\u30d5\u30a9\u30fc\u30eb\uff09<\/p>\n<\/th>\n<th colspan=\"1\" rowspan=\"1\">\n<p>\u30a2\u30b8\u30e3\u30a4\u30eb\uff08\u6025\u304e\uff09<\/p>\n<\/th>\n<th colspan=\"1\" rowspan=\"1\">\n<p>\u30a2\u30b8\u30e3\u30a4\u30eb\uff08\u30d0\u30e9\u30f3\u30b9\u578b\uff09<\/p>\n<\/th>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\">\n<p><strong>\u30bf\u30a4\u30df\u30f3\u30b0<\/strong><\/p>\n<\/td>\n<td colspan=\"1\" rowspan=\"1\">\n<p>\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u524d\u306b\u8a2d\u8a08\u3092\u5b8c\u4e86<\/p>\n<\/td>\n<td colspan=\"1\" rowspan=\"1\">\n<p>\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u4e2d\u306b\u8a2d\u8a08\uff08\u81e8\u6642\u7684\uff09<\/p>\n<\/td>\n<td colspan=\"1\" rowspan=\"1\">\n<p>\u6a5f\u80fd\u958b\u767a\u3068\u4e26\u884c\u3057\u3066\u8a2d\u8a08<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\">\n<p><strong>\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8<\/strong><\/p>\n<\/td>\n<td colspan=\"1\" rowspan=\"1\">\n<p>\u521d\u671f\u6bb5\u968e\u3067\u91cd\u3044\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u4f5c\u6210<\/p>\n<\/td>\n<td colspan=\"1\" rowspan=\"1\">\n<p>\u6700\u5c0f\u9650\u307e\u305f\u306f\u5b58\u5728\u3057\u306a\u3044<\/p>\n<\/td>\n<td colspan=\"1\" rowspan=\"1\">\n<p>\u30b3\u30fc\u30c9\u306b\u3088\u308b\u30e9\u30a4\u30d6\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\">\n<p><strong>\u5909\u66f4<\/strong><\/p>\n<\/td>\n<td colspan=\"1\" rowspan=\"1\">\n<p>\u5909\u66f4\u306b\u30b3\u30b9\u30c8\u304c\u304b\u304b\u308b<\/p>\n<\/td>\n<td colspan=\"1\" rowspan=\"1\">\n<p>\u5909\u66f4\u306f\u5bb9\u6613\u3060\u304c\u30ea\u30b9\u30af\u304c\u9ad8\u3044<\/p>\n<\/td>\n<td colspan=\"1\" rowspan=\"1\">\n<p>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30b9\u30af\u30ea\u30d7\u30c8\u3067\u7ba1\u7406<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\">\n<p><strong>\u7126\u70b9<\/strong><\/p>\n<\/td>\n<td colspan=\"1\" rowspan=\"1\">\n<p>\u5b8c\u74a7\u3055<\/p>\n<\/td>\n<td colspan=\"1\" rowspan=\"1\">\n<p>\u30b9\u30d4\u30fc\u30c9<\/p>\n<\/td>\n<td colspan=\"1\" rowspan=\"1\">\n<p>\u5b89\u5b9a\u6027 + \u901f\u5ea6<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>\u6280\u8853\u7684\u8ca0\u50b5\u306e\u30b3\u30b9\u30c8 \ud83d\udcb8<\/h2>\n<p>ERD\u306e\u4f5c\u6210\u304c\u6025\u304c\u308c\u308b\u3068\u3001\u5358\u306b\u5373\u6642\u306e\u6642\u9593\u306e\u640d\u5931\u3068\u3044\u3046\u3060\u3051\u3067\u306a\u304f\u3001\u6570\u304b\u6708\u5f8c\u306b\u9855\u5728\u5316\u3059\u308b\u6280\u8853\u7684\u8ca0\u50b5\u306e\u84c4\u7a4d\u304c\u751f\u3058\u307e\u3059\u3002\u3053\u306e\u8ca0\u50b5\u306f\u65b0\u3057\u3044\u6a5f\u80fd\u958b\u767a\u306e\u901f\u5ea6\u3092\u4f4e\u4e0b\u3055\u305b\u3001\u672c\u756a\u74b0\u5883\u3067\u306e\u969c\u5bb3\u767a\u751f\u306e\u53ef\u80fd\u6027\u3092\u9ad8\u3081\u307e\u3059\u3002<\/p>\n<h3>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u4f4e\u4e0b<\/h3>\n<p>\u4e0d\u9069\u5207\u306b\u8a2d\u8a08\u3055\u308c\u305f\u30b9\u30ad\u30fc\u30de\u306f\u3001\u30d5\u30eb\u30c6\u30fc\u30d6\u30eb\u30b9\u30ad\u30e3\u30f3\u3092\u5f15\u304d\u8d77\u3053\u3057\u307e\u3059\u3002\u30c7\u30fc\u30bf\u91cf\u304c\u5897\u3048\u308b\u306b\u3064\u308c\u3066\u3001\u30af\u30a8\u30ea\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306f\u6307\u6570\u95a2\u6570\u7684\u306b\u4f4e\u4e0b\u3057\u307e\u3059\u3002ERD\u306b\u9069\u5207\u306a\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u6226\u7565\u304c\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u306a\u3044\u3068\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306f\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30b9\u30bf\u30c3\u30af\u5168\u4f53\u306e\u30dc\u30c8\u30eb\u30cd\u30c3\u30af\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<h3>\u30c7\u30fc\u30bf\u6574\u5408\u6027\u306e\u554f\u984c<\/h3>\n<p>\u53b3\u683c\u306a\u5236\u7d04\uff08\u4f8b\uff1a\u4e00\u610f\u5236\u7d04\u3001\u30c1\u30a7\u30c3\u30af\u5236\u7d04\u3001\u5916\u90e8\u30ad\u30fc\uff09\u304c\u306a\u3051\u308c\u3070\u3001\u7121\u52b9\u306a\u30c7\u30fc\u30bf\u304c\u30b7\u30b9\u30c6\u30e0\u306b\u6d41\u5165\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u5f8c\u3067\u3053\u306e\u30c7\u30fc\u30bf\u3092\u30af\u30ea\u30fc\u30cb\u30f3\u30b0\u3059\u308b\u306b\u306f\u3001\u5931\u6557\u3057\u3084\u3059\u304f\u30c7\u30fc\u30bf\u640d\u5931\u3092\u5f15\u304d\u8d77\u3053\u3059\u53ef\u80fd\u6027\u306e\u3042\u308b\u8907\u96d1\u306a\u30b9\u30af\u30ea\u30d7\u30c8\u304c\u5fc5\u8981\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<h3>\u30c7\u30d7\u30ed\u30a4\u306e\u6469\u64e6<\/h3>\n<p>\u30b9\u30ad\u30fc\u30de\u306e\u9032\u5316\u306b\u660e\u78ba\u306a\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u8a08\u753b\u304c\u306a\u3051\u308c\u3070\u3001\u30c7\u30d7\u30ed\u30a4\u30d1\u30a4\u30d7\u30e9\u30a4\u30f3\u304c\u58ca\u308c\u307e\u3059\u3002\u30c1\u30fc\u30e0\u306f\u6a5f\u80fd\u958b\u767a\u3088\u308a\u3082\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u30a8\u30e9\u30fc\u4fee\u6b63\u306b\u591a\u304f\u306e\u6642\u9593\u3092\u8cbb\u3084\u3059\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u5909\u66f4\u306b\u5bfe\u3059\u308b\u6050\u6016\u611f\u304c\u5e83\u304c\u308a\u307e\u3059\u3002<\/p>\n<h2>\u30d0\u30e9\u30f3\u30b9\u306e\u53d6\u308c\u305f\u30e2\u30c7\u30ea\u30f3\u30b0\u306e\u305f\u3081\u306e\u6226\u7565 \ud83e\udde0<\/h2>\n<p>\u901f\u304f\u9032\u3093\u3067\u3082\u30c7\u30fc\u30bf\u306e\u54c1\u8cea\u3092\u7dad\u6301\u3059\u308b\u3053\u3068\u306f\u53ef\u80fd\u3067\u3059\u3002\u305d\u306e\u9375\u306f\u3001\u300c\u3061\u3087\u3046\u3069\u3088\u3044\u300d\u8a2d\u8a08\u54f2\u5b66\u3092\u63a1\u7528\u3059\u308b\u3053\u3068\u306b\u3042\u308a\u307e\u3059\u3002\u30c1\u30fc\u30e0\u306e\u30a2\u30d7\u30ed\u30fc\u30c1\u3092\u6539\u5584\u3059\u308b\u305f\u3081\u306e\u5b9f\u884c\u53ef\u80fd\u306a\u6226\u7565\u3092\u4ee5\u4e0b\u306b\u793a\u3057\u307e\u3059\u3002<\/p>\n<h3>1. \u30b9\u30ad\u30fc\u30de\u306e\u6bb5\u968e\u7684\u9032\u5316<\/h3>\n<p>\u5b8c\u74a7\u306a\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3092\u6700\u521d\u304b\u3089\u8a2d\u8a08\u3057\u3088\u3046\u3068\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u30b9\u30ad\u30fc\u30de\u3092\u751f\u304d\u3066\u3044\u308b\u30a2\u30fc\u30c6\u30a3\u30d5\u30a1\u30af\u30c8\u3068\u3057\u3066\u6271\u3044\u307e\u3057\u3087\u3046\u3002\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u5b9a\u7fa9\u306b\u5bfe\u3057\u3066\u30d0\u30fc\u30b8\u30e7\u30f3\u7ba1\u7406\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u5909\u66f4\u5c65\u6b74\u3092\u8ffd\u8de1\u3067\u304d\u3001\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u5143\u306b\u623b\u3059\u3053\u3068\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li>\n<p>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30b9\u30af\u30ea\u30d7\u30c8\u3092\u30d0\u30fc\u30b8\u30e7\u30f3\u7ba1\u7406\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<\/li>\n<li>\n<p>\u30b9\u30ad\u30fc\u30de\u5b9a\u7fa9\u3092\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30b3\u30fc\u30c9\u3068\u4e00\u7dd2\u306b\u30ea\u30dd\u30b8\u30c8\u30ea\u306b\u4fdd\u6301\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<\/li>\n<li>\n<p>\u30b9\u30ad\u30fc\u30de\u306e\u5909\u66f4\u306f\u3001\u5358\u306b\u5b64\u7acb\u3057\u3066\u691c\u8a0e\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u30b3\u30fc\u30c9\u30ec\u30d3\u30e5\u30fc\u306e\u969b\u306b\u3082\u691c\u8a0e\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<\/li>\n<\/ul>\n<h3>2. \u30e2\u30c7\u30eb\u99c6\u52d5\u958b\u767a\u30ef\u30fc\u30af\u30d5\u30ed\u30fc\u306e\u5c0e\u5165<\/h3>\n<p>\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30ed\u30b8\u30c3\u30af\u3092\u66f8\u304f\u524d\u306b\u3001\u30c7\u30fc\u30bf\u30e2\u30c7\u30eb\u3092\u5b9a\u7fa9\u3057\u307e\u3057\u3087\u3046\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30b3\u30fc\u30c9\u304c\u30c7\u30fc\u30bf\u5236\u7d04\u3068\u6574\u5408\u3059\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u6700\u7d42\u7684\u306a\u56f3\u3092\u4f55\u9031\u9593\u3082\u5f85\u3064\u3068\u3044\u3046\u610f\u5473\u3067\u306f\u306a\u304f\u3001\u30b9\u30d7\u30ea\u30f3\u30c8\u306e\u521d\u671f\u6bb5\u968e\u3067\u30b3\u30a2\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306b\u3064\u3044\u3066\u5408\u610f\u3059\u308b\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002<\/p>\n<ul>\n<li>\n<p>\u6a5f\u80fd\u306e\u30b3\u30a2\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3092\u7279\u5b9a\u3057\u307e\u3059\u3002<\/p>\n<\/li>\n<li>\n<p>\u95a2\u4fc2\u6027\u3068\u5236\u7d04\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002<\/p>\n<\/li>\n<li>\n<p>\u3053\u306e\u5408\u610f\u306b\u57fa\u3065\u3044\u3066\u30b3\u30fc\u30c9\u3084\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u751f\u6210\u3057\u307e\u3059\u3002<\/p>\n<\/li>\n<\/ul>\n<h3>3. \u30b9\u30ad\u30fc\u30de\u691c\u8a3c\u306e\u81ea\u52d5\u5316<\/h3>\n<p>\u81ea\u52d5\u5316\u30c4\u30fc\u30eb\u3092\u4f7f\u7528\u3057\u3066\u3001\u30b9\u30ad\u30fc\u30de\u5185\u306e\u4e00\u822c\u7684\u306a\u60aa\u7fd2\u6163\u3092\u30c1\u30a7\u30c3\u30af\u3057\u307e\u3057\u3087\u3046\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u958b\u767a\u8005\u306e\u8a8d\u77e5\u8ca0\u8377\u304c\u8efd\u6e1b\u3055\u308c\u3001\u4e00\u8cab\u6027\u304c\u4fdd\u305f\u308c\u307e\u3059\u3002<\/p>\n<ul>\n<li>\n<p>\u5916\u90e8\u30ad\u30fc\u306b\u6b20\u843d\u3057\u3066\u3044\u308b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u306a\u3044\u304b\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n<\/li>\n<li>\n<p>\u3059\u3079\u3066\u306e\u30c6\u30fc\u30d6\u30eb\u306b\u30d7\u30e9\u30a4\u30de\u30ea\u30ad\u30fc\u304c\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b\u304b\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n<\/li>\n<li>\n<p>\u547d\u540d\u898f\u5247\u304c\u9075\u5b88\u3055\u308c\u3066\u3044\u308b\u304b\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n<\/li>\n<\/ul>\n<h2>\u5f79\u5272\u9593\u306e\u30b3\u30df\u30e5\u30cb\u30b1\u30fc\u30b7\u30e7\u30f3\u30ae\u30e3\u30c3\u30d7 \ud83d\udde3\ufe0f<\/h2>\n<p>ERD\u306e\u843d\u3068\u3057\u7a74\u306e\u6700\u5927\u306e\u539f\u56e0\u306e\u4e00\u3064\u306f\u3001\u958b\u767a\u8005\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u7ba1\u7406\u8005\u3001\u30d7\u30ed\u30c0\u30af\u30c8\u30aa\u30fc\u30ca\u30fc\u306e\u9593\u306e\u65ad\u7d76\u3067\u3059\u3002\u5404\u30b0\u30eb\u30fc\u30d7\u306f\u7570\u306a\u308b\u512a\u5148\u9806\u4f4d\u3092\u6301\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<ul>\n<li>\n<p><strong>\u958b\u767a\u8005\uff1a<\/strong> 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