The beta Ni function, as Krig has reminded us, is defined by Gulenko as the intent to avoid past mistakes. In my view, beta Ni is made up of eight information processors which allow us to conceptualize choice and compare choices made.
The IM element processed by beta Ni is choice. Choices are related to each other in terms of their influence in comparison to another available choice. If the influence is more positive than the other choice, then the choice is comparatively positive. If the influence is negative, then the choice is comparatively negative.
How is the state of influence, for the positive or the negative, judged? The answer is relative to progress towards an idealized state, a positive potential outcome (in socionics terms, the relationship between delta Ne aspects). If a choice realizes positive potential, then it is positive. If it realizes negative potential, then it is negative. Potentials are, of course, judged relative to each other. Properly, one speaks of "scenarios", complexes of potential states that may be positive or negative. Starting from a state of observed negative potentials, we say a choice is "right" if the resulting outcome is a state whereat the situation is more positive than it previously was. Correspondingly, we say it is wrong if the situation is comparatively more negative. Of course, these judgments are completely relative and reflect our feelings about elements of the potential scenario and current situation.
Looking at choice from a subelements point of view, we can perceive of choice as a change of destiny with regard to a specific event (a gamma Ni aspect). If an event is allowed to pass, then the state of the permissitivity is positive; if not, its permissitivity is negative. A change in our decision to let the event stand or not, is the making of a choice.
I'm looking for a specific word in place of "event permissivity", but it escapes me. Has it even been coined...?
Continuing, we reflect on a choice when we evaluate it based on the positivity of its outcome -- that is, the actual state that resulted compared with what we believed the choice would result in.