Originally Posted by
Dmitri Lytov
That's simple. Jung presented descriptions of 8 types in his Psychological Types (1920), and these descriptions, without any corrections, were later accepted by both Myers and competing analytical psychologists as descriptions of Dominant functions.
At the same time, Myers revised Jung's concept of rationality (judgment) / irrationality (perception), you know how.
Augusta read the same Jung's work, Psychological Types (1920), and it also served as a basis of description of Program functions of the socionic types. However, Augusta found several inconsistencies in descriptions of these functions, and later she presented REVISED descriptions of all the 8 functions in her Duality of Human Nature (1982). She presented extraverted functions as energy-spending and introverted as energy-saving, and eliminated from the original Jung's descriptions everything that contradicted to this concept. In fact, she had to correct descriptions of only 2 functions, Se and Si; the remaining 6 functions were left almost intact.
At the same time, she left Jung's concept of rationality (judgment) / irrationality (perception) "as is".
Therefore, both Myers and Augusta revised Jung in their own way, and this is the reason of contradictions between the two theories.