<P> He later added a third dimension, psychoticism, resulting in his "P-E-N" three factor model of personality . This has been correlated with two separate factors developed by the Big Five personality traits (Five Factor Model), called "agreeableness" and "conscientiousness"; the former being similar to the people / task orientation scale elaborated above . Neuroticism in Eysenck's case acted like the people / task - orientation scale (except for being inverted as to which temperaments were "high" or "low"), but was later separated as a distinct factor in the Big Five . </P> <P> Carl Jung, in the early 20th century, introduced the four factors that would become a part of the later MBTI, and these included extroversion / introversion, sensing and intuition, and thinking / feeling, which would be correlated to Agreeableness, with Judging - Perceiving roughly as Conscientiousness . </P> <P> Ernst Kretschmer (1888--1964) divided personality into two "constitutional groups": Schizothymic, which contain a "Psychaesthetic proportion" between sensitive and cold poles, and Cyclothymic which contain a "Diathetic" proportion between gay and sad . The Schizoids consist of the Hyperesthetic (sensitive) and Anesthetic (Cold) characters, and the Cycloids consist of the Depressive (or "melancholic") and Hypomanic characters . </P> <P> David W. Keirsey would make the connection of the two groups with Myers' Sensors and iNtuitors, providing the two factors for his four temperaments . He would rename Sensing to "Observant" or "Concrete", and Intuiting to "Introspection" or "Abstract", and pair it with "Cooperative" versus "Pragmatic" (or "Utilitarian") which would be the "Conscientiousness" scale; to form: </P>

Who propagated two factor theory of personality given by