A method for the study of visual working memory capacity (Luck & Vogel, 1997). In each trial, a series of items (e.g. colored squares), whose number varies from one trial to another, is presented to the subject, followed, after a short delay, by an arrangement test. The subject is asked to indicate whether this arrangement is identical or different (e.g. one of the squares has a different color) to the previous arrangement. This method enables to study visual working memory capacity for a characteristic of an object (e.g. color), and a combination of characteristics (color and orientation, for example).