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class="vector-toc-numb">1</span> <span><span>Purpose</span></span> </div> </a> <ul id="toc-Purpose-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Books" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Books"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Books</span> </div> </a> <ul id="toc-Books-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Subjects" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Subjects"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Subjects</span> </div> </a> <ul id="toc-Subjects-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Projects" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Projects"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Projects</span> </div> </a> <ul id="toc-Projects-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Organizational" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Organizational"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Organizational</span> </div> </a> <ul id="toc-Organizational-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Subcategories" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Subcategories"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>Subcategories</span> </div> </a> <ul id="toc-Subcategories-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-How_categories_work" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#How_categories_work"> <div class="vector-toc-text"> <span class="vector-toc-numb">7</span> <span>How categories work</span> </div> </a> <ul id="toc-How_categories_work-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-See_also" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#See_also"> <div class="vector-toc-text"> <span class="vector-toc-numb">8</span> <span>See also</span> </div> </a> <ul id="toc-See_also-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Contents" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " 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Available in 4 languages" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-4" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">4 languages</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikibooks.org/wiki/%E0%A4%B5%E0%A4%BF%E0%A4%95%E0%A4%BF%E0%A4%AA%E0%A5%81%E0%A4%B8%E0%A5%8D%E0%A4%A4%E0%A4%95:%E0%A4%B6%E0%A5%8D%E0%A4%B0%E0%A5%87%E0%A4%A3%E0%A4%BF%E0%A4%AF%E0%A4%BE%E0%A4%81" title="विकिपुस्तक:श्रेणियाँ – Hindi" lang="hi" hreflang="hi" data-title="विकिपुस्तक:श्रेणियाँ" data-language-autonym="हिन्दी" data-language-local-name="Hindi" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikibooks.org/wiki/Wikibooks:Categorie" title="Wikibooks:Categorie – Italian" lang="it" hreflang="it" data-title="Wikibooks:Categorie" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikibooks.org/wiki/%D0%92%D0%B8%D0%BA%D0%B8%D1%83%D1%87%D0%B5%D0%B1%D0%BD%D0%B8%D0%BA:%D0%9A%D0%B0%D1%82%D0%B5%D0%B3%D0%BE%D1%80%D0%B8%D0%B7%D0%B0%D1%86%D0%B8%D1%8F" title="Викиучебник:Категоризация – Russian" lang="ru" hreflang="ru" data-title="Викиучебник:Категоризация" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-si mw-list-item"><a href="https://si.wikibooks.org/wiki/%E0%B7%80%E0%B7%92%E0%B6%9A%E0%B7%92%E0%B6%B4%E0%B7%9C%E0%B6%AD%E0%B7%8A:%E0%B6%B4%E0%B7%8A%E2%80%8D%E0%B6%BB%E0%B7%80%E0%B6%BB%E0%B7%8A%E0%B6%9C" title="විකිපොත්:ප්‍රවර්ග – Sinhala" lang="si" hreflang="si" data-title="විකිපොත්:ප්‍රවර්ග" data-language-autonym="සිංහල" data-language-local-name="Sinhala" class="interlanguage-link-target"><span>සිංහල</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q4167836#sitelinks-wikibooks" title="Edit interlanguage links" class="wbc-editpage">Edit links</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="Namespaces"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-associated-pages" > <div class="vector-menu-content"> <ul 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.ombox-speedy{background-color:#310402}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .ombox-speedy{background-color:#310402}}</style><table class="plainlinks ombox ombox-notice" role="presentation"><tbody><tr><td class="mbox-image"><span typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/1/1d/Information_icon4.svg/40px-Information_icon4.svg.png" decoding="async" width="40" height="40" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/1d/Information_icon4.svg/60px-Information_icon4.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/1d/Information_icon4.svg/80px-Information_icon4.svg.png 2x" data-file-width="620" data-file-height="620"/></span></span></td><td class="mbox-text"><table class="shortcutbox noprint" style="float:right; border:1px solid #aaaaaa; background:#ffffff; margin:0em 0em 0em 1em; padding:3px; text-align:center; line-height:1.1em"><tbody><tr><th style="border:none; background:transparent;"><span id="WB:CAT"></span><small><a href="/wiki/Wikibooks:Shortcuts" title="Wikibooks:Shortcuts">Shortcut</a>: <br/> <a href="/wiki/Wikibooks:CAT" class="mw-redirect" title="Wikibooks:CAT">WB:CAT</a></small></th></tr></tbody></table> <b>This page contains useful information about the Wikibooks project.</b><br/>While this is not a listing of rules or policies, it contains information about an important Wikibooks process, custom etc. This page should be helpful to our users; please <a href="/wiki/Wikibooks:CHAT" class="mw-redirect" title="Wikibooks:CHAT">let us know</a> if it is not.</td></tr></tbody></table> <table class="metadata plainlinks ambox ambox-content" style=""> <tbody><tr> <td class="mbox-image"><div style="width: 52px;"> <span typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/91/Book_important2.svg/40px-Book_important2.svg.png" decoding="async" width="40" height="40" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/91/Book_important2.svg/60px-Book_important2.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/91/Book_important2.svg/80px-Book_important2.svg.png 2x" data-file-width="128" data-file-height="128"/></span></span></div></td> <td class="mbox-text" style=""> <b>This book may need to be updated to reflect current knowledge.</b><br/><small>You can <a class="external text" href="https://en.wikibooks.org/w/index.php?title=Wikibooks:Categories&action=edit">help update it</a>, <a href="/wiki/Wikibooks_talk:Categories" title="Wikibooks talk:Categories">discuss progress</a>, or <a href="/wiki/Wikibooks:PROJECT" class="mw-redirect" title="Wikibooks:PROJECT">request assistance</a>.</small> </td> </tr> </tbody></table> <p>Wikibooks uses several methods of page organization, the easiest of which are <b>categories</b>. This page discusses how to categorize pages properly. </p> <figure class="mw-default-size mw-halign-right" typeof="mw:File"><a href="/wiki/File:Wikibooks_structure.svg" class="mw-file-description" title="The structure of Wikibooks: Categories and subjects contain books, which themselves contain pages and modules."><img alt="Structure of Wikibooks" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/41/Wikibooks_structure.svg/400px-Wikibooks_structure.svg.png" decoding="async" width="400" height="200" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/41/Wikibooks_structure.svg/600px-Wikibooks_structure.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/41/Wikibooks_structure.svg/800px-Wikibooks_structure.svg.png 2x" data-file-width="400" data-file-height="200"/></a><figcaption>The structure of Wikibooks: Categories and subjects contain books, which themselves contain pages and modules.</figcaption></figure> <div class="noprint" style="float:left; margin:0.25em 0.5em 0.5em 0.25em; padding:0.5em 1.4em 0.8em 0em; background:transparent;"><meta property="mw:PageProp/toc"/></div> <p><br style="clear:left;"/> </p> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><h2 id="Purpose" data-mw-thread-id="h-Purpose"><span data-mw-comment-start="" id="h-Purpose"></span><span id="Categories">Purpose</span><span data-mw-comment-end="h-Purpose"></span></h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Wikibooks:Categories&action=edit&section=1" title="Edit section's source code: Purpose"><span>edit source</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Categories achieve three main goals in the organization of books: </p> <ol><li>Categories <b>serve as "book binders";</b> holding all pages or chapters of a book together in their own category.</li> <li>Categories <b>sort books by subject matter</b>. Thus, the "book binders" of all books on a subject will appear in a particular category. This allows navigation through all books from general to the most specific subjects.</li> <li>Categories serve to <b>identify problem areas</b> so that people can <a href="/wiki/Wikibooks:Maintenance" title="Wikibooks:Maintenance">help improve books and the Wikibooks project</a>.</li></ol> <p>Categories also allow automated lists of related pages to be compiled, because any changes to a category will cause any lists depending on the category to be updated as well. The most common example of this is in the construction of <a href="/wiki/Subject:SUBJECTS" class="mw-redirect" title="Subject:SUBJECTS">subject pages</a>. </p><p>The sections below explain how to categorize books using the different methods to ensure books can be easily found. </p> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><h2 id="Books" data-mw-thread-id="h-Books"><span data-mw-comment-start="" id="h-Books"></span>Books<span data-mw-comment-end="h-Books"></span></h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Wikibooks:Categories&action=edit&section=2" title="Edit section's source code: Books"><span>edit source</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>A <b>book category</b> is a category that indexes all pages, templates and media of a single book. Each book should have its own book category. </p> <ul><li>What to do:</li></ul> <dl><dd>For each page of the book, other than its main page, just place {{<a href="/wiki/Template:BookCat" title="Template:BookCat">BookCat</a>}} at the bottom of the page. Alternatively, place {{<a href="/wiki/Template:BookCat" title="Template:BookCat">BookCat</a>}} inside any template intended to be used on all pages of the book, which takes care of all the pages that use that template. It does no harm to do both, and no harm if {{<a href="/wiki/Template:BookCat" title="Template:BookCat">BookCat</a>}} ends up on the main page of the book (which might easily happen by accident if a template containing {{<a href="/wiki/Template:BookCat" title="Template:BookCat">BookCat</a>}} is also used on the book main page).</dd></dl> <ul><li>How it works:</li></ul> <dl><dd>Book categories use names based on the name of the book itself, with a prefix <code>Book:</code>. For example, the book category for a book titled "Cryptozoology" should be "Category:Book:Cryptozoology". Books and book categories should be categorized by subject using all the same subject categories (we'll discuss subject categories next).</dd></dl> <dl><dd><dl><dd><i>Historically, book categories didn't have a prefix <code>Book:</code>, so the book category for title "Cryptozoology" would be "Category:Cryptozoology". We are slowly converting to the new naming convention; many pre-existing book categories on the site use the old convention.</i></dd></dl></dd></dl> <dl><dd>The {{<a href="/wiki/Template:BookCat" title="Template:BookCat">BookCat</a>}} device automatically deduces, from the name of the page it is on, what book it's in, files the page it is on into the book's category, and sorts the pages inside that category by the portion of the page name following the name of the book. As a result, the book category provides an alphabetical index of all the book's pages.</dd></dl> <dl><dd>Template {{<a href="/wiki/Template:BOOKCATEGORY" title="Template:BOOKCATEGORY">BOOKCATEGORY</a>}} produces the name of the book category of the book associated with the page on which it occurs; or, you can provide it with a page name as a parameter, <code>{{<a href="/wiki/Template:BOOKCATEGORY" title="Template:BOOKCATEGORY">BOOKCATEGORY</a>|<page name>}}</code>, and it will produce the name of the book category of the book associated with <page name>. Currently, {{<a href="/wiki/Template:BOOKCATEGORY" title="Template:BOOKCATEGORY">BOOKCATEGORY</a>}} can detect whether a given book uses the old or new convention for book-category names; and it would also presumably handle any future change in the naming convention (if such a thing should ever happen).</dd></dl> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><h2 id="Subjects" data-mw-thread-id="h-Subjects"><span data-mw-comment-start="" id="h-Subjects"></span>Subjects<span data-mw-comment-end="h-Subjects"></span></h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Wikibooks:Categories&action=edit&section=3" title="Edit section's source code: Subjects"><span>edit source</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>A <b>subject category</b> is a category that groups together books on a related topic. </p> <ul><li>What to do:</li></ul> <dl><dd>On the main page of each book, place <code>{{<a href="/wiki/Template:Subjects" title="Template:Subjects">subjects</a>|...}}</code> at the bottom of the page, replacing "..." with one or more names of subjects, separated by "pipe" characters (the vertical bar, like the one just before the "..." in the example: <code>|</code> ).</dd></dl> <dl><dd>Books should only be added to subjects as specific as possible. For example, the book <a href="/wiki/Music_Theory" title="Music Theory">Music Theory</a> is located in <a href="/wiki/Subject:Music_theory" title="Subject:Music theory">Subject:Music theory</a>, but not in <a href="/wiki/Subject:Music" title="Subject:Music">Subject:Music</a>, because musical theory is a more specific topic than music. Most books only belong to one or two subjects; use multiple subjects only to aid in finding books that are legitimately important to several subject areas and not used to simply advertise new books. Subjects are used to help make finding books easier, so proper filing of books in subjects is important.</dd></dl> <dl><dd>Examples: at this writing, book <i><b><a href="/wiki/Modern_History" title="Modern History">Modern History</a></b></i> has <code>{{<a href="/wiki/Template:Subjects" title="Template:Subjects">subjects</a>|History}}</code>, while book <i><b><a href="/wiki/HydroGeoSphere" title="HydroGeoSphere">HydroGeoSphere</a></b></i> has <code>{{<a href="/wiki/Template:Subjects" title="Template:Subjects">subjects</a>|Geology|Computer software}}</code>.</dd></dl> <ul><li>How it works:</li></ul> <dl><dd>Subject categories use names based on the name of the subject, with a prefix <code>Subject:</code>. Subject names use <a href="https://en.wikipedia.org/wiki/sentence_case" class="extiw" title="w:sentence case">sentence casing</a> because, unlike books, the name of a subject is not a <i>title</i>. For example, the subject category for <a href="/wiki/Subject:Music_theory" title="Subject:Music theory">Subject:Music theory</a> would be <a href="/wiki/Category:Subject:Music_theory" title="Category:Subject:Music theory">Category:Subject:Music theory</a>. A subject should only be created when there are multiple books that can be added to it.</dd></dl> <dl><dd>Each subject has three pages associated with it: <ul><li>a subject page, called "Subject:<name>", which is the primary place to go for topic <name>. The subject page explains what the subject is about; says what other subject or subjects this one is contained in, and what other subjects are contained in this one; lists books on this subject by how complete they are; and lists featured books on this subject. The book lists include books in subsections as well as books filed directly in that subject. The very biggest subjects, like <a href="/wiki/Subject:Mathematics" title="Subject:Mathematics">Subject:Mathematics</a>, list subsections but not books, because the list of books would be so awkwardly long.</li> <li>a subject category, called "Category:Subject:<name>", which contains just those books that are filed specifically under that subject. This page echoes the information display from the subject page.</li> <li>an internal category, whose page is not meant to be publicly viewed, called "Category:Subject:<name>/all books", which contains all books filed under the subject or any other subject contained within it.</li></ul></dd> <dd>The {{<a href="/wiki/Template:Subjects" title="Template:Subjects">subjects</a>}} template on a book main page knows what subjects the book should be filed under. Each subject page has information on it naming the one or two parent subjects containing that subject. The various pages share information between them automatically to populate the internal categories, which enable the subject pages — and the subject categories — to list books in all subsections as well as books filed directly in the subject.</dd></dl> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><h2 id="Projects" data-mw-thread-id="h-Projects"><span data-mw-comment-start="" id="h-Projects"></span>Projects<span data-mw-comment-end="h-Projects"></span></h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Wikibooks:Categories&action=edit&section=4" title="Edit section's source code: Projects"><span>edit source</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>A <b>project category</b> is a category for associating several related books with a particular project. For instance, all books written for a single course curriculum (science, math, and language books). For these situations, you should add all the related books into the necessary project categories. </p> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><h2 id="Organizational" data-mw-thread-id="h-Organizational"><span data-mw-comment-start="" id="h-Organizational"></span>Organizational<span data-mw-comment-end="h-Organizational"></span></h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Wikibooks:Categories&action=edit&section=5" title="Edit section's source code: Organizational"><span>edit source</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Wikibooks uses a number of other organizational schemes, such as an <a href="/wiki/Wikibooks:ABC" class="mw-redirect" title="Wikibooks:ABC">Alphabetical</a> listing and a <a href="/wiki/Wikibooks:Reading_Levels" title="Wikibooks:Reading Levels">Reading Levels</a> system. Each of these organization systems use categories to produce lists of books. </p> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><h2 id="Subcategories" data-mw-thread-id="h-Subcategories"><span data-mw-comment-start="" id="h-Subcategories"></span>Subcategories<span data-mw-comment-end="h-Subcategories"></span></h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Wikibooks:Categories&action=edit&section=6" title="Edit section's source code: Subcategories"><span>edit source</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>A <b>subcategory</b> is a category that links to one or more other categories through the use of the category system, effectively creating a parent-child relationship. All categories should be a subcategory of one or more other categories, except for the <a href="/wiki/Category:CATS" class="mw-redirect" title="Category:CATS">root category</a>. By using subcategories, we can all navigate through the category system faster and more effectively to find the book, page, image, or template we are looking for. </p><p>Subcategories should only be created as needed, such as dividing a large subject or book category in order to find books or pages more quickly. Any new category created for this purpose should have a good descriptive name that shares some common characteristics with the larger category name. For example, <a href="/wiki/Category:Subject:Music_theory" title="Category:Subject:Music theory">Category:Subject:Music theory</a> is a subcategory of <a href="/wiki/Category:Subject:Music" title="Category:Subject:Music">Category:Subject:Music</a> and effectively describes a common relationship between the two categories. Another example is <a href="/wiki/Category:Subject:Algebra" title="Category:Subject:Algebra">Category:Subject:Algebra</a> and <a href="/wiki/Category:Subject:Mathematics" title="Category:Subject:Mathematics">Category:Subject:Mathematics</a>. </p><p>Book subcategories are also sometimes used; for instance, if a book is not using a flat structure and consists of several chapters with many subpages in each one, <code>{{<a href="/wiki/Template:BookCat" title="Template:BookCat">BookCat</a>|filing=deep}}</code> can be placed on the pages of the book or in a template placed on those pages to create subcategories of the form <span class="nowrap"><code>Category:Book Name/Chapter Name</code></span>. Then simply add {{<a href="/wiki/Template:BookCat" title="Template:BookCat">BookCat</a>}} to those subcategories to automatically place them in the root book category of the book. </p> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><h2 id="How_categories_work" data-mw-thread-id="h-How_categories_work"><span data-mw-comment-start="" id="h-How_categories_work"></span>How categories work<span data-mw-comment-end="h-How_categories_work"></span></h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Wikibooks:Categories&action=edit&section=7" title="Edit section's source code: How categories work"><span>edit source</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Pages are listed in categories by adding a category link on pages (usually at the bottom). For example, this project was listed in <a href="/wiki/Category:Categories" title="Category:Categories">Category:Categories</a> by adding: </p> <dl><dd><pre>[[Category:Categories|{{SUBPAGENAME}}]]</pre></dd></dl> <p>The subpagename magic word helps organize category pages by sorting pages by name. This can be particularly useful for books since all pages begin with the book name. </p><p>Now say you were looking for information on animal behavior. In this case, there is only one distinct path to find books on the subject: </p> <ul><li><a href="/wiki/Category:Categories" title="Category:Categories">Category:Categories</a> (organizational category) <ul><li><a href="/wiki/Category:Subject:Books_by_subject" title="Category:Subject:Books by subject">Category:Subject:Books by subject</a> (organizational category) <ul><li><a href="/wiki/Category:Subject:Science" title="Category:Subject:Science">Category:Subject:Science</a> (subject category) <ul><li><a href="/wiki/Category:Subject:Biology" title="Category:Subject:Biology">Category:Subject:Biology</a> (subject category) <ul><li><a href="/wiki/Category:Subject:Zoology" title="Category:Subject:Zoology">Category:Subject:Zoology</a> (subject category)</li></ul></li></ul></li></ul></li></ul></li></ul> <p>If you wanted <a href="/wiki/Animal_Behavior" title="Animal Behavior">Animal Behavior</a> to be found here, you would need to add {{<a href="/wiki/Template:BookCat" title="Template:BookCat">BookCat</a>}} to the bottom of each page, add <code>{{<a href="/wiki/Template:Subjects" title="Template:Subjects">subjects</a>|zoology}}</code> to <a href="/wiki/Animal_Behavior" title="Animal Behavior">Animal Behavior</a>, and add {{<a href="/wiki/Template:BookCat" title="Template:BookCat">BookCat</a>}} to <a href="/wiki/Category:Book:Animal_Behavior" title="Category:Book:Animal Behavior">Category:Book:Animal Behavior</a>. (In this case, {{<a href="/wiki/Template:BookCat" title="Template:BookCat">BookCat</a>}} figures out that the page it's on is a book category, and looks at the book's main page to see what subjects it belongs to.) By now you should be starting to understand how Zoology is added to Biology, and so on. </p><p>In general, categories go from the most general to the most specific category. You can link to a category by adding: </p> <dl><dd><pre>[[:Category:Category Name|display text]]</pre></dd></dl> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><h2 id="See_also" data-mw-thread-id="h-See_also"><span data-mw-comment-start="" id="h-See_also"></span>See also<span data-mw-comment-end="h-See_also"></span></h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Wikibooks:Categories&action=edit&section=8" title="Edit section's source code: See also"><span>edit source</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Using_Wikibooks/Shelves,_Categories,_and_Classifications" title="Using Wikibooks/Shelves, Categories, and Classifications">Using Wikibooks/Shelves, Categories, and Classifications</a></li></ul> <p>See <a href="/wiki/Help:Category" class="mw-redirect" title="Help:Category">Help:Category</a> for a description of categories in Wikimedia projects in 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title="Help:FAQ/Problems">Problems</a></span></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Help:Contents" title="Help:Contents">Help</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"><span style="white-space:nowrap"><a href="/wiki/Help:Glossary" title="Help:Glossary">Glossary</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Help:Navigating" title="Help:Navigating">Navigating</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Help:Pages" title="Help:Pages">Pages (Creating, Namespaces, Discussing, Archiving, Moving, Merging, Deleting)</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Help:Tracking_changes" title="Help:Tracking changes">Tracking changes</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Help:Account_management" title="Help:Account management">Account management</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Help:Contributing" title="Help:Contributing">Contributing (Why and why not contribute? Starting a book)</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Help:Editing" title="Help:Editing">Editing</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Help:Categories" title="Help:Categories">Categories</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Help:Files" title="Help:Files">Files</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Help:Tables" title="Help:Tables">Tables</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Help:Variables" title="Help:Variables">Variables</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Help:Formulas" title="Help:Formulas">Formulas</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Help:Quizzes" title="Help:Quizzes">Quizzes</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Help:Local_manuals_of_style" title="Help:Local manuals of style">Local manuals of style</a> (<a 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href="/wiki/Help:Export" title="Help:Export">Export</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Help:Print_versions" title="Help:Print versions">Print versions</a> <b>·</b></span> <span style="white-space:nowrap"> Help books (<a href="/wiki/Using_Wikibooks" title="Using Wikibooks">Using Wikibooks</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Editing_Wikitext" title="Editing Wikitext">Editing Wikitext</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Cascading_Style_Sheets" title="Cascading Style Sheets">CSS</a>)</span></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Templates</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"><span style="white-space:nowrap"><a href="/wiki/Help:Templates" title="Help:Templates">Template help</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Wikibooks:Templates" title="Wikibooks:Templates">Template index</a> (<a href="/wiki/Wikibooks:Templates/Book_information" title="Wikibooks:Templates/Book information">Book information</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Wikibooks:Templates/General" title="Wikibooks:Templates/General">General</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Wikibooks:Templates/Sources" title="Wikibooks:Templates/Sources">Sources</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Wikibooks:Templates/Links" title="Wikibooks:Templates/Links">Links</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Wikibooks:Templates/Navigation" title="Wikibooks:Templates/Navigation">Navigation</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Wikibooks:Templates/Files" title="Wikibooks:Templates/Files">Files</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Wikibooks:Templates/Media" title="Wikibooks:Templates/Media">Media</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Wikibooks:Templates/Maintenance" title="Wikibooks:Templates/Maintenance">Maintenance</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Wikibooks:Templates/Licensing_issues_notices" title="Wikibooks:Templates/Licensing issues notices">Licensing issues notices</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Wikibooks:Templates/Deletion" title="Wikibooks:Templates/Deletion">Deletion</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Wikibooks:Templates/Stubs" title="Wikibooks:Templates/Stubs">Stubs</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Wikibooks:Templates/User_messages" title="Wikibooks:Templates/User messages">User messages</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Wikibooks:Templates/User_notices" title="Wikibooks:Templates/User notices">User notices</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Wikibooks:Templates/User_pages" title="Wikibooks:Templates/User pages">User pages</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Wikibooks:Templates/Discussion" title="Wikibooks:Templates/Discussion">Discussion</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Wikibooks:Templates/Featured_books" title="Wikibooks:Templates/Featured books">Featured books</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Wikibooks:Templates/Policies_and_guidelines" title="Wikibooks:Templates/Policies and guidelines">Policies and guidelines</a>) <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Category:Templates" title="Category:Templates">Template categories</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Editing_Wikitext/Making_Templates_A101" title="Editing Wikitext/Making Templates A101">Making Templates A101</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Editing_Wikitext/Templates_Ready_to_Use" title="Editing Wikitext/Templates Ready to Use">Templates Ready to Use</a></span></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Wikibooks:Reading_room" title="Wikibooks:Reading room">Reading room</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"><span style="white-space:nowrap"><a href="/wiki/Wikibooks:Reading_room/General" title="Wikibooks:Reading room/General">General</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Wikibooks:Reading_room/Proposals" title="Wikibooks:Reading room/Proposals">Proposals</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Wikibooks:Reading_room/Projects" title="Wikibooks:Reading room/Projects">Projects</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Wikibooks:Featured_books/Nominations" title="Wikibooks:Featured books/Nominations">Featured books</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Wikibooks:Reading_room/Assistance" title="Wikibooks:Reading room/Assistance">General</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Wikibooks:Reading_room/Technical_Assistance" title="Wikibooks:Reading room/Technical Assistance">Technical</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Wikibooks:Reading_room/Administrative_Assistance" title="Wikibooks:Reading room/Administrative Assistance">Administrative</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Wikibooks:Requests_for_deletion#Deletion" title="Wikibooks:Requests for deletion">Deletion</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Wikibooks:Requests_for_deletion#Undeletion" title="Wikibooks:Requests for deletion">Undeletion</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Wikibooks:Requests_for_import" title="Wikibooks:Requests for import">Import</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Wikibooks:Requests_for_permissions" title="Wikibooks:Requests for permissions">Permissions</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Wikibooks:Reading_room/Bulletin_Board" title="Wikibooks:Reading room/Bulletin Board">Bulletin Board</a></span></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Category:Useful_Wikibooks_pages" title="Category:Useful Wikibooks pages">Useful pages</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"><span style="white-space:nowrap"><a href="/wiki/Wikibooks:Accuracy_dispute" class="mw-redirect" title="Wikibooks:Accuracy dispute">Accuracy dispute</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Wikibooks:Authorship" title="Wikibooks:Authorship">Authorship</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Wikibooks:Autoblock" title="Wikibooks:Autoblock">Autoblock</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Wikibooks:Book_donations" title="Wikibooks:Book donations">Book donations</a> <b>·</b></span> <span style="white-space:nowrap"> <a class="mw-selflink selflink">Categories</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Wikibooks:Dealing_with_vandalism" title="Wikibooks:Dealing with vandalism">Dealing with vandalism</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Wikibooks:Dewikify" title="Wikibooks:Dewikify">Dewikify</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Wikibooks:How_to_obtain_public_domain_books" title="Wikibooks:How to obtain public domain books">How to obtain public domain books</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Wikibooks:Language_Learning_Difficulty_for_English_Speakers" title="Wikibooks:Language Learning Difficulty for English Speakers">Language Learning Difficulty</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Wikibooks:Licensing_guidelines" title="Wikibooks:Licensing guidelines">Licensing guidelines</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Wikibooks:NPOV_dispute" title="Wikibooks:NPOV dispute">NPOV dispute</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Wikibooks:Reading_Levels" title="Wikibooks:Reading Levels">Reading Levels</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Wikibooks:Render_as_PNG" title="Wikibooks:Render as PNG">Render as PNG</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Wikibooks:Subject_pages" title="Wikibooks:Subject pages">Subject pages</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Wikibooks:Textbook_standards" title="Wikibooks:Textbook standards">Textbook standards</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Wikibooks:User_rights" title="Wikibooks:User rights">User rights</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Wikibooks:Wikibooks_for_course_instructors" title="Wikibooks:Wikibooks for course instructors">Wikibooks for course instructors</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Wikibooks:Wikibooks_for_Wikimedians" title="Wikibooks:Wikibooks for Wikimedians">Wikibooks for Wikimedians</a> <b>·</b></span> <span style="white-space:nowrap"> <a href="/wiki/Wikibooks:Wikimedia" title="Wikibooks:Wikimedia">Wikimedia</a></span></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Category:Wikibooks" title="Category:Wikibooks">Other<br/>project pages</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"><span 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