Socionics divides people into 16 different types, called sociotypes. They are most commonly referred to by their two strongest functions, which in socionics are called the "leading" function (Jung's dominant) and the "creative" function (Jung's auxiliary). The creative function is opposite to the leading function in extraversion and rationality. For example, if the dominant function is introverted logic (a rational and introverted function), the secondary function must be irrational and extraverted, which means it must be either extraverted sensing or extraverted intuition.