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Ерөнхий ойлголт: Ерөнхий диаграм (CAD -Context Analysis Diagram ) Энэ диаграм нь хамгийн дээд түвшний диаграм бөгөөд системийн хүрээ хязгаар хаагуур хязгаарлагдах, гадаад орчинтой хэрхэн харилцан үйлчлэлцэхийг харуулдаг. Энэ диаграмд нийт системийг дүрсэлж чадахуйц нэг процесс, гадаад объектууд дүрслэгддэг.
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