Louis Leon Thurstone

IMPORTANCE: served as a transition between early development and applications of classical test theory (up to the date of publication) and books by Guilford (1936) and Gulliksen (1950) -- the latter noted explicitly his link to Thurstone's earlier text in his acknowledgements (pp. ix-x). Used by Thurstone to teach an entire generation of psychometricians at University of Chicago between 1924 and 1952 (including among others Ledyard Tucker, Paul Horst, Harold Gulliksen, Frederic Kuder, William Angoff, & Clyde Coombs). After a preface, there are 20+ sections that seem to focus more on reliability than on validity (which might be expected given the date of publication) with the final section consisting of problems (51 in number, and foreshadowing Appendices C & D in Gulliksen, 1950). I had a mimeographed copy of this book (dated 1932) that I scanned into digital form (received original from a prof at OSU who had been a student at University of Chicago during the early 1950s).