Second, grades in particular have been found to have a detrimental effect on creative thinking, long-term retention, interest in learning, and preference for challenging tasks (Butler & Nisan, 1986; Grolnick & Ryan, 1987). These detrimental effects are not the result of too many bad grades, too many good grades, or the wrong formula for calculating grades. Rather, they result from the practice of grading itself, and the extrinsic orientation it promotes. Parental use of rewards or consequences to induce children to do well in school has a similarly negative effect on enjoyment of learning and, ultimately, on achievement (Gottfried et al., 1994). Avoiding these effects requires assessment practices geared toward helping students experience success and failure not as reward and punishment, but as information.