Unlike some other reproductions of classic texts (1) We have not used OCR(Optical Character Recognition), as this leads to bad quality books with introduced typos. (2) In books where there are images such as portraits, maps, sketches etc We have endeavoured to keep the quality of these images, so they represent accurately the original artefact. Although occasionally there may be certain imperfections with these old texts, we feel they deserve to be made available for future generations to enjoy.

Volume 1 contains the central documents of the functionalist tradition, displaying its foundations and growth. Volume 2 presents the founding manifesto of the Chicago instrumentalism, John Dewey's Studies in Logical Theory (1903), and a selection of the most significant reactions to it; and Volume 3 reprints Psychology, by the acknowledged leader of the Chicago Functionalism movement, James R. Agnell (1904). Introduced by Andrew Backe, the text is accompanied by the key secondary works that followed its publication.