Three years ago, Greenwald, McGhee, and Schwartz (1998) presented a new method to measure differential evaluative association of two target concepts: the Implicit Association Test (IAT). It has been asserted that the IAT allows for the assessment of implicit attitudes by comparing response times in two combined discrimination tasks. Although the distribution and employment of this method has been quite successful, the processes underlying IAT-effects, as well as the psychometric properties of specific IAT-variants, have received relatively little attention up to now. The articles included in the present special issue especially focus on these aspects.