Recall isomerism – the ability of a chemical compound, without changing its composition, to form substances with different properties. Subtypes are nothing more than unique psychological isomers. The existence of varieties of a type is a completely normal phenomenon within the framework of a biological outline.
I proposed long ago a sufficiently systematic solution to the problem of intra-type differences near the end of the 1980s. In this report I would like to present a contemporary appraisal of the problem.
Purely theoretically, the subtype problem can be solved in two ways.
The first way lies through the introduction of special dichotomies. With respect to the customary common type dichotomies, they bear a more concrete nature, thus coming out as lower level factors. I call this procedure combinatorial-dichotomous.
The alternate path examines the strengthening of various functions within the framework of the classical sociomodel (Model A). The fact is that the manifestation (and development) of a function is not [always] equal to its position – its hierarchical place within the structure of the psyche. In spite of being equally located, i.e. occupying one and the same position in the sociomodel, functions can have completely different degrees of manifestation. This arrangement, according to the tenets of this approach, forms the subtype’s special behavioral features. This concept, in contrast to the combinatorial-dichotomous approach mentioned above, can be named functional-positional.