Ganin described MBTI as a "bloody mess". I think the same can be said for Socionics; this is in light of the subtypes issue, Model A, and the constant j/p crisis.
Model A is overcomplicated and neglects subtypes. It is too rigid in that whatever is contained in the ego block is rigidly reflected in the rest of Model A.
Below is my theory, which I believe is the next stage of the evolution of psychological theory; it eliminates the j/p crisis and incorporates subtypes. I believe it is more dynamic, and at the same time, less complicated than Model A.
On the whole, the model I have created is a better representation of reality, in comparison to Model A.
I will use examples to explain my theory.
INTj with intuitive subtype is better represented as I-NT-FS.
INTj with logical subtype or balanced subtype is better represented as I-TN-FS.
INTp with intuitive subtype or balanced subtype is better represented as I-NT-SF.
INTp with logical subtype is better represented as I-TN-SF.
are unneccessary and can be replaced by T, F, S and N.
The first letter (from the left) denotes whether the type is extroverted or introverted.
The second letter (from the left to right) denotes the strongest function of the type.
The third letter (from the left to right) denotes the second strongest function of the type.
The fourth letter (from the left to right) denotes the third strongest function of the type.
The fifth letter (from the left to right) denotes the fourth strongest function of the type.
This is a better representation of each type.
The type representation has two blocks. From left to right, after the introversion/extroversion representation is the strong block. After that is the weak block.
I/E - [Strong block] - [Weak block]
Each block can only contain one rational function (that is, T or F) and one irrational function (that is, S or N).
You will note that the weak block of the INTj types is the same regardless of the subtype, and so is the last block of the INTp types. However the strong block for the INTj types or the INTp types is not identical.
The weak block indicates the type of a person. The strong block indicates the subtype of a person.
The last letter of the weak block signifies j or p in socionics. If the last letter is an irrational function (that is, S or N) then the type is j (rational). If it is a rational function (that is, T or F) then the type is p (irrational). For socionists, the weak block along with the I/E representation is an indicator to the Socionics equivalent of the type. So if the weak block of an introverted type is FS, then a socionist will know that the type in Socionics is INTj. If th weak block of an introverted type is SF, then a socionist will know that the type in Socionics is INTp.
There is no need to dicuss j/p and no need to discuss subtypes and no need to discuss Model A.
For the type I-NT-FS (INTj with intuitive subtype), the perfect dual is E-SF-TN (ESFj with sensing subtype); the imperfect dual is E-FS-TN (ESFj with feeling subtype).
The basic Socionics intertype relations remain the same. However there will be many more variations due to the subtype inclusion.
The thing that makes my representation of type better than the conventional representation of type is the fact that it includes all the functions - T, F, N and S - and my representation shows the level of strength for each function for each psychological type.