A second example, not based on the NEO PI-R, concerns the construct impulsivity. Over the last several years, clinical researchers have recognized that the term impulsivity has been used in a variety of ways. Different measures with that label sometimes measure what appear to be different constructs, and many impulsivity measures appear to include items tapping multiple constructs (Bagby, Joffe, Parker, & Schuller, 1993; Depue & Collins, 1999; Evenden, 1999; Fischer, Smith, & Cyders, 2008; Petry, 2001; Smith et al., 2007; Whiteside & Lynam, 2001, 2003; Whiteside, Lynam, Miller, & Reynolds, 2005; Zuckerman, 1994).
