“…When asked to report a “before” score 6 weeks after beginning a program, respondents may simply forget the extent of their knowledge levels 6 weeks earlier, leading to inaccurate ratings due to error or response-style bias (Hassan, 2006). Younger children (preschool and early grades) have limited recall strategies and are especially susceptible to retrospective recall biases (Laursen, Denissen, & Bjorklund, 2012), including recall of specific events (Shin, Bjorklund, & Beck, 2007), imagined versus experienced events (Foley, Ratner, & Gentes, 2010), and overestimation errors (Principe, Haines, Adkins, & Guiliano, 2010). When asked to complete “then” and “now” ratings on the same page, people’s scores are more highly correlated simply by virtue of their reporting these two scores at the same time, resulting in a systematic bias (Campbell & Fiske, 1959; Podsakoff, MacKenzie, Lee, & Podsakoff, 2003).…”