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دهبندی دهدهی دیوئی (DDC)، ردهبندی مشهور علوم کتابداری و اطلاعرسانی برای تعیین موضوع اصلی کتاب میباشد. این ردهبندی جهانی در سهولت انتخاب، تحقیق، تعیین مکان، فهرست نویسی علمی کتابها نقش مؤثر دارد.
این ردهبندی در سال ۱۸۷۶ میلادی به وسیلة ملویل دیویی، یک کتابدار آمریکایی ابداع و بکار برده شد و سپس همواره مورد تجدید نظر قرار گرفتهاست. این ردهبندی یک ردهبندی منطقی فلسفی و علمی است و زمینه همه دانشهای بشری ابتدا به ده رده یا موضوع کلی تقسیم میشود؛ و هر رده در نوبت دوم به ده رده دیگر (صد عنوان موضوعی) و در نوبت سوم باز هر رده به ده رده دیگر (هزار عنوان موضوعی) تقسیم میشود. در گسترش ردهبندیهای دیگر با رقمهای اعشاری موضوعها خاصتر و ریزتر میشود.
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