David Keirsey became familiar with the work of Ernst Kretschmer and William Sheldon after WWII in the late 1940s.
The table below shows how Myers' and Keirsey's types correspond to other temperament theories or constructs, dating from ancient times to the present day.
][citation needed] Keirsey expanded on the ancient study of temperament by Hippocrates and Plato.
In his works, Keirsey used the names suggested by Plato: Artisan (iconic), Guardian (pistic), Idealist (noetic), and Rational (dianoetic).
Correlating with the NF (intuitive–feeling) Myers-Briggs types, the Idealist temperament comprises the following role variants (listed with their correlating Myers-Briggs types): Champion (ENFP), Counselor (INFJ), Healer (INFP), and Teacher (ENFJ).
Seeking meaning and significance, they are concerned with personal growth and finding their own unique identity.
Correlating with the NT (intuitive–thinking) Myers-Briggs types, the Rational temperament comprises the following role variants (listed with their correlated Myers-Briggs types): Architect (INTP), Fieldmarshal (ENTJ), Inventor (ENTP), and Mastermind (INTJ).
Keirsey's temperaments correlate with Myers' combinations of preferences: Guardians with sensing plus judging (SJ); Artisans with sensing plus perceiving (SP); Idealists with intuition plus feeling (NF); and Rationals with intuition plus thinking (NT).
Myers paired ESTJs with ENTJs, ISFPs with INFPs, INTPs with ISTPs, and ENFJs with ESFJs because they share the same dominant function attitude.
[9] In a 2001 peer-reviewed study published in the Journal of Career Assessment, data from the Keirsey Temperament Sorter II online instrument and Myers–Briggs Type Indicator (MBTI) for 203 college freshmen were analyzed and compared.