The impetus for this volume began with our research in the 1980's involving serial neuropsychological evaluation with various patient populations. At that time, reports on the practice effects associated with routinely utilized clinical neuropsychological instruments were sparse. While test-retest data were available for almost all assessment instruments, this was usually in the form of correlation coefficients and not changes in mean performance between or across assessment periods (see McCaffrey & Westervelt, 1995 for a detailed discussion of these and related issues). Clinical...