Systemising is defined by Baron-Cohen as the drive to analyse or construct systems, where a system is any domain that lends itself to rules predicting or explaining how the domain works. The precise scope of this idea is vague: it is usually related to subject matter such as science, engineering and maths, but other domains could also be defined in terms of systems and rules. Baron-Cohen proposes that people with autism have a cognitive profile characterised by a high level of systemising ability, together with limited empathising ability. (See also empathising, Empathy Quotient (EQ) and Systemising Quotient (SQ).)