D. F. McKenzie extended previous notions of bibliography as set forth by 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 artefacts 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 well as other texts how they are designed, edited, printed, circulated, reprinted, collected.