SIGNIFICANCE: Practitioners of clinical trials have a responsibility to ensure that patients participation in research be informed and voluntary. This responsibility implies that we should strive continuously to improve the effectiveness of methods for informing prospective research volunteers about experimental studies, thereby enhancing the protection of their interests. If the self-monitoring technique tested in EQUIC-SM proves to enhance the quality of informed consent, this technique may be adapted for wider use in conducting clinical trials, thus representing an important step towards this goal.