Comparability and stability of performance of six alternate forms of the dodrill-stroop colour-word test

The stability of performance of individual subjects repeating the Dodrill-Stroop Colour-Word Test has not previously been reported. Moreover, only one form of the test has been published. Five additional forms were constructed for this study and their equivalence to Dodrill's form was demonstrated. Stability of performance on all of the forms was assessed in one testing session. Form equivalence was established but stable performance on the test was not obtained until the second trial after which scores reached asymptotic levels.