What + and − Function Signs Actually Mean

What + and − Function Signs Actually Mean
I think function signs get oversimplified a lot as if + and − are just two different “styles” of the same function.
In the School of System Socionics interpretation, the difference is more fundamental: the sign changes the competence area of the function — its scale, direction, distance, and what parts of the information space it can adequately process.
The easiest way to understand it is:
− functions have the wider field
+ functions operate inside a narrower field
The diagram on page 1 shows this literally: the + area sits inside the larger − area.
A minus function processes information:
globally / generally
outwardly
at both close and far psychological distance
in both positive and negative areas
A plus function processes information:
locally / specifically
inwardly
at close psychological distance
in the positive area only
This is why the relationship is asymmetrical.
A − function can operate in the positive area because that area is already contained inside its larger competence field.
So something like Se− can move into Se+ territory after dealing with the broader negative field.
For example:
secure the position
identify threats and restrictions
preserve freedom of movement
then expand, acquire, or advance
But the reverse does not work equally well.
A + function does not adequately process the full − area. The document specifically says that when a + function is forced into its minus area, its responses can resemble those of a one-dimensional function, regardless of the function’s actual dimension. It also tends to avoid that area altogether.
So a 4D Se+ function can still look strangely limited when dealing with the full Se− field.
It can react to a clear threat.
It can defend something.
It can notice an obvious restriction.
But that is different from naturally processing the whole negative field — hidden vulnerabilities, distant threats, limits, conservation of force, and what could potentially remove your ability to act.
That’s the part people miss.
+ and − aren’t two equal switches that everyone can flip between.
The − function has the broader competence area and includes both positive and negative information.
The + function specializes in the narrower positive area.
So the simplest way I’d put it is:
Minus can go into plus because plus is contained within its field.
Plus cannot fully go into minus without leaving its area of competence.
That distinction becomes really important when comparing types like SEE Se+ vs SLE Se−, because they may eventually perform the same visible behavior while arriving there through very different information processing.