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An intentionally blank page is a page that is devoid of content, and may be unexpected. Such pages may serve purposes ranging from place-holding to space-filling and content separation. Sometimes, these pages carry a notice such as, "This page () intentionally left blank." Such notices typically appear in printed works, such as legal documents, manuals, and exam papers, in which the reader might otherwise suspect that the blank pages are due to a printing error and where missing pages might have serious consequences. ==Uses for intentionally blank pages== Intentionally blank pages are usually the result of printing conventions and techniques. Chapters conventionally start on an odd-numbered page (recto page); therefore, if the preceding chapter happens to have an odd number of pages, a blank page is inserted at the end. Book pages are often printed on large sheets because of technical and financial considerations. Thus, a group of 8, 16, or 32 consecutive pages will be printed on a single sheet in such a way that when the sheet is mechanically folded and cut, the pages will be in the correct order for binding. This is called an even working, and the group of pages is called a section or signature. Books printed in this manner will always have a number of pages which is a multiple of the number in such a signature, such as a multiple of 8, 16, or 32. As a result, these books will usually have pages left blank, unless by chance or editorial ingenuity the exact number of pages are printed. For example, if a book with 318 pages of content is printed using 32-page signatures, it will require 10 signatures, 320 pages in total. At the very end of the book — that is, at the end of the last signature — there will be 2 unused (blank) pages. If a printer's document processor has been designed to skip completely blank pages, notices may also be required on intentionally blank pages to prevent incorrect page numbering. Intentionally blank pages are ubiquitous in technical and instructional manuals, directories, and other large, mass-produced volumes of text. The contents of manuals produced by a given product's vendor are often compiled from generic instructions suitable for a variety of products, with additional instructions or chapters included for the specific product or model in question. This automation of manual-generation leads to intentionally blank pages to fit the requirements for mass printing. In digital documents, pages are intentionally left blank so that the document can be printed correctly in double-sided format, rather than have new chapters start on the backs of pages. Intentionally blank pages have also been used in documents distributed in ring binders. The intention is to leave room for expansion without breaking the document's page numbering. This allows updates to be made to a document while requiring minimal new pages, reducing printing costs. The only drawback is the increased time required by the reader to manually insert various newly updated pages into their correct locations in the document. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Intentionally blank page」の詳細全文を読む スポンサード リンク
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