The strength of a function is decided by how many dimensions it covers. There are four different stages, four different strengths of a function, starting at covering one dimension, and going up to two four dimensional functions.
Using the stack of an INTP/LII as an example, the two weakest functions, Se and Fe, are one dimensional (1D), and the two strongest, Ti and Ni, are four dimensional (4D).
The first dimension is called experience. This is the most basic dimension, to which our use of our dual-seeking (inferior) and vulnerable functions (Fe and Se for INTP) are limited. It’s a copy-paste function, we need experience with a situation for this function to work. While, because of this, being the most limited functions, we’re also very individualistic in our approach to them. Since they are only based on our experience, we do not understand the rules that surrounds it, the standard ways of doing something, and has our own approach, for good or bad.
The second dimension is norms, and applies to the mobilizing (tertiary) and role function, (for an INTP, Si and Fi). The functions in this area can be used through the two first dimensions. They are more sophisticated than the one dimensional functions, as they add the second dimension of norms. This is where we excel at understanding the rules that surrounds the function, the standard, and the allowed way of doing something. It creates a rigid approach, especially for the role function. We can’t create with it, since it’s limited to what the rules and norms are.
The third dimension, situation, is for the creative (auxiliary) and ignoring function (Ne and Te for INTPs). Here is where creativity comes in, and where we can adapt with the function. We invent, come up with new solutions, and adapt, with this function. Here is where the functions starts being called “strong” by socioncis. With two dimensional functions, we had to learn a new “standard” to change our ways. Here, we see the information at hand, and adapt to the best way to approach it.
The fourth dimension, for the dominant and demonstrative functions, the two strongest, most sophisticated and well developed. It introduces a dynamic aspect where we not only see a situational approach to something, but understands it through the flow of time. We see information processed through these functions as a film, rather than still pictures that we see from the other functions. We look at how and why something happens, not just that it does. We have the full perspective.