Library classification

Libraries use systems to group books.

This helps people find things. It puts similar books together on shelves.

Long ago, people organized books in broad ways. Some people used their own ideas. This changed as more books were made.

One man made rules for private books. He wanted them to be useful and beautiful. He also liked the idea of public libraries.

Now, libraries use many different systems. Some systems cover all subjects. Other systems focus on one topic.

Each book gets a special number. This number is like a home address. It tells you where to look.

It is fun to find a new book.

Libraries use systems to organize books and other things. These systems help people find what they need. Each item gets a call number. This number is like a home address for the book. It tells you exactly where to find it on the shelf.

Long ago, people organized books in very broad ways. In the third century BC, a scholar named Callimachus made a list. This was one of the first known ways to group books. Later, libraries were often organized by the person in charge. Some used language, and others used how books were printed.

As more books were made, new ways were needed. In 1627, Gabriel Naudé wrote a book about libraries. He made seven classes for books. These included history, math, and medicine. He also believed libraries should be open to all people.

Today, there are many systems. Some cover every subject. Others focus on just one topic, like music or art. Most libraries use a system to group similar things together. This makes it easy to browse the shelves.

Library classification is a system used to organize many things. These items include books, videos, and even electronic materials. Libraries use these systems for shelves and for digital catalogs. Each item gets a special call number. This number acts like a home address for the item. It tells you exactly where to find it in the building.

Classification helps group similar things together. This makes it much easier for people to find what they need.

There are different ways a library can organize its items. Some use a hierarchical tree structure. This means they start with a broad subject and move to specific details. Other systems use a faceted method. This allows one item to have many different classifications at once. Most systems are actually a blend of these two ways. For example, the Dewey Decimal Classification uses both methods. It uses a hierarchy for general topics but adds details later.

People have been organizing libraries for a very long time. The earliest known scheme was called the Pinakes. A scholar named Callimachus created it in the third century BC. During the Renaissance, libraries were often organized by the person in charge. Some collections were sorted by language or how they were printed. After the printing revolution in the sixteenth century, things changed. There were too many books for those old ways to work. By the nineteenth century, libraries needed much more detailed systems.

Many famous people helped shape how we find books today. In 1627, Gabriel Naudé wrote a book about building libraries. He worked with a private collection that had 8,000 printed books. Naudé created seven classes like history, math, and medicine. He also believed that libraries should be open to everyone. Around 1644, the Bibliothèque Mazarine became the first public library in France. Later, Jacques Charles Brunet made a modern system in 1842. His system had five major classes, including sciences and arts.

Today, we use many different types of classification systems. Universal schemes like the Dewey Decimal Classification cover all subjects. Some schemes are specific to just one topic. For example, Iconclass is used for art. Other systems are made for specific countries. The Library of Congress Classification is used by many large research libraries. In small libraries, people might use a simple method. They might just group books by interests like travel or crime. This helps everyone navigate the huge world of information.

Library classification is a specialized system used to organize information materials. These materials include books, sound recordings, video recordings, and electronic resources. Libraries use these systems to arrange items on physical shelves and within digital catalogs or indexes. Each item is assigned a unique call number. This call number acts as a specific address for the item within the library's system.

Unlike scientific classification, which seeks to organize knowledge theoretically, library classification focuses on practical utility. Its primary goal is to provide a useful ordering of documents for readers. By grouping similar items together, the system helps users navigate vast collections of information.

To achieve this, classification systems follow specific mechanisms. First, a cataloger or catalog librarian must ascertain the subject or topic of the material. Once the subject is identified, they assign a call number using the library's specific notation. This process is part of technical services, often grouped with descriptive cataloging. A key rule in physical library classification is that each work can only have one class. This is necessary because a book can only occupy one physical location on a shelf. However, in digital or classified catalogs, a work may have multiple entries to help people find it. Many systems, such as the Dewey Decimal Classification (DDC), also add a cutter number. This is a code used to identify the main entry, such as the author, to further organize the items.

There are three main ways to categorize these classification systems. Universal schemes cover all possible subjects. Examples include the Dewey Decimal Classification (DDC) and the Universal Decimal Classification (UDC). Specific classification schemes focus on particular subjects or material types. For instance, Iconclass is used for art, while the NLM Classification is used for medicine. National schemes are created for specific countries. The Library of Congress Classification (LCC) was designed for the United States Library of Congress. While it has American, European, and Christian biases, it is used widely in large academic and research libraries.

Classification systems also function through different organizational structures. Enumerative systems list subjects alphabetically and assign numbers to each heading. Hierarchical systems organize subjects in a tree-like structure, moving from general topics to very specific ones. Faceted or analytico-synthetic systems divide subjects into mutually exclusive, orthogonal facets. A faceted system allows for more complex combinations of attributes. The first true faceted system was the colon classification created by S. R. Ranganathan. Most modern systems, like the LCC and DDC, are primarily enumerative but include hierarchical or faceted elements. Newer systems often rely heavily on the principle of synthesis, which combines codes from different lists to represent a work's various attributes.

The history of library organization spans thousands of years. The earliest known scheme was the Pinakes, created by the scholar Callimachus at the Library of Alexandria in the third century BC. During the Renaissance and Reformation, libraries were often organized based on the personal knowledge or whims of those in charge. Some collections were sorted by language or printing methods. However, the printing revolution in the sixteenth century created so many new materials that these broad methods became unworkable. This led to the development of more granular, detailed classifications during the nineteenth century. Jacques Charles Brunet developed the Paris Bookseller's classification in 1842, which is considered the first modern book classification. His system utilized five major classes: theology, jurisprudence, sciences and arts, belles-lettres, and history.

Significant figures have also shaped the philosophy of library access. In 1627, Gabriel Naudé published Advice on Establishing a Library. He was working in the private library of Henri de Mesmes II, which held approximately 8,000 printed books and many manuscripts. Naudé's system used seven classes, including theology, medicine, and mathematics, which later expanded to twelve. Naudé also advocated for public libraries that were open to everyone regardless of their ability to pay. His influence helped the Bibliothèque Mazarine in Paris become the first public library in France around 1644. These historical shifts moved libraries from closed collections for elites to open resources for the public.

Today, classification serves two vital roles in information science. First, it facilitates subject access by helping users find what a library holds on a specific topic. Second, it provides a known physical location for the source on a shelf. In the 20th century, as libraries opened their stacks to the public, classification became essential for browsing. Some systems are better for finding subjects, while others are better for shelf arrangement. For example, the Universal Decimal Classification is highly expressive regarding subject relationships but uses a complex notation that is difficult for shelf organization. In very small libraries, a "mark and park" or reader interest classification might be used. This simple method groups items into broad categories like travel or crime to help users navigate small collections easily.