Hello Carter and Barker (2010) describe bibliography as a twofold scholarly discipline—the organized listing of books (enumerative bibliography) and the systematic, description of books as physical objects (descriptive bibliography). These two distinct concepts and practices have separate rationales and serve differing purposes. Innovators and originators in the field include W. W. Greg, Fredson Bowers, Philip Gaskell, and G. Thomas Tanselle.

Bowers (1949) refers to enumerative bibliography as a procedure that identifies books in “specific collections or libraries,” in a specific discipline, by an author, printer, or period of production (3). He refers to descriptive bibliography as the systematic description of a book as a material or physical artifact. Analytical bibliography, the cornerstone of descriptive bibliography, investigates the printing and all physical features of a book that yield evidence establishing a book's history and transmission (Feather 10). It is the preliminary phase of bibliographic description and provides the vocabulary, principles and techniques of analysis that descriptive bibliographers apply and on which they base their descriptive practice.

Descriptive bibliographers follow specific conventions and associated classification in their description. Titles and title pages are transcribed in a quasi-facsimile style and representation. Illustration, typeface, binding, paper, and all physical elements related to identifying a book follow formulaic conventions, as Bower's established in his foundational opus, The Principles of Bibliographic Description. The thought expressed in this book expands substantively on W. W. Greg’s groundbreaking theory that argued for the adoption of formal bibliographic principles (Greg 29). Fundamentally, analytical bibliography is concerned with objective, physical analysis and history of a book while descriptive bibliography employs all data that analytical bibliography furnishes and then codifies it with a view to identifying the ideal copy or form of a book that most nearly represents the printer’s initial conception and intention in printing.

In addition to viewing bibliographic study as being composed of four interdependent approaches (enumerative, descriptive, analytical, and textual), Bowers notes two further subcategories of research, namely historical bibliography and aesthetic bibliography.[2] Both historical bibliography, which involves the investigation of printing practices, tools, and related documents, and aesthetic bibliography, which examines the art of designing type and books, are often employed by analytical bibliographers.

D. F. McKenzie extended previous notions of bibliography as set forth by W. W. Greg, Bowers, Gaskell and Tanselle. He describes the nature of bibliography as "the discipline that studies texts as recorded forms, and the processes of their transmission, including their production and reception" (1999 12). This concept broadens the scope of bibliography to include "non-book texts" and an accounting for their material form and structure, as well as textual variations, technical and production processes that bring sociocultural context and effects into play. McKenzie's perspective contextualizes textual objects or artifacts with sociological and technical factors that have an effect on production, transmission and, ultimately, ideal copy (2002 14). Bibliography, generally, concerns the material conditions of books [as well as other texts] how they are designed, edited, printed, circulated, reprinted, collected.[3]

Bibliographic works differ in the amount of detail depending on the purpose and can generally be divided into two categories: enumerative bibliography (also called compilative, reference or systematic), which results in an overview of publications in a particular category and analytical or critical bibliography, which studies the production of books.[4][5] In earlier times, bibliography mostly focused on books. Now, both categories of bibliography cover works in other media including audio recordings, motion pictures and videos, graphic objects, databases, CD-ROMs[6] and websites.