A questionnaire-based measure of systemising devised by Baron-Cohen and colleagues. A person’s overall test score on the SQ is assumed to reflect their ability to systemise. Each member of a population can receive a low, high or average score. On average, females tend to score lowest whereas people on the autism spectrum generally have high scores, although there is also considerable overlap. (See also empathising, Empathising-systemising theory, and systemising)