A brief, objective representation of the essential content of a book, article, speech, report, dissertation, patent, standard, or other work, presenting the main points in the same order as the original but having no independent literary value. A well-prepared abstract enables the reader to 1) quickly identify the basic content of the document, 2) determine its relevance to their interests, and 3) decide whether it is worth their time to read the entire document. An abstract can be informative, indicative, critical, or written from a particular point of view (slanted). Examples of the various types of abstracts can be seen in the Appendix of the ANSI/NISO Z39.14 Guidelines for Abstracts.

Length depends on the type of document abstracted and the intended use of the abstract. As a general rule, abstracts of long documents, such as monographs and theses, are limited to a single page (about 300 words); abstracts of papers, articles, and portions of monographs are no longer than 250 words; abstracts of notes and other brief communications are limited to 100 words; and abstracts of very short documents, such as editorials and letters to the editor, are about 30 words long. In a scholarly journal article, the abstract should appear on the first page, following the title and name(s) of author(s) and preceding the text. In a separately published document, the abstract should be placed between the title page and the text. In an entry in a printed indexing and abstracting service or bibliographic database, the abstract accompanies the citation. Because the abstract is a searchable field in most bibliographic databases, attention must be paid by the abstractor to the keywords included in it. Authorship of an abstract can be unattributed or indicated by name or initials. An author-supplied abstract is usually written by the author of the work abstracted. Compare with summary.

 

 

Reference: Wikipedia