Dewey biography number

The Dewey Decimal Classification system is a classifying system used by libraries to organize their collections. It was first introduced to the public in by Melvil Dewey, a founding member of the American Library Association. It is the most widely used classification system in the world. Libraries in over countries use the system to organize and provide access to their collections.

The Dewey Decimal system is subject based. That's one of the great things about the system; you don't need the names of authors or book titles if you are looking for books on a certain topic. You just need the call number , which is the group of numbers you'll find on the spine of a book. Specific call numbers for a particular item will vary from library to library depending on how the library chooses to classify their collection, but generally Dewey Decimal libraries will follow the same system of assigning a call number to an item or they'll just use the Dewey Decimal number assigned to the item by the Library of Congress.

Each item is assigned a three digit number, which corresponds to a broad subject group that the item would fall under. There are ten broad subject headings:.

Ddc classification number

As you can imagine, these topics are incredibly broad. Take the s, for example--the subject is "Technology. If you want to research applied physics, you don't want to waste time looking through books on child rearing. So, how do you narrow down your search?

Dewey 921

The Dewey Decimal system further breaks these subjects into subclasses by adding two digits. For example:. As the number becomes more specific, so does the subject matter.