you probably cant find the term much around anymore because it was changed in 2013 in regards to DID.

in general terms a persons executive functions are their behaviors, decision making abilities, how a person interacts in social or work situations, able to take care of one self / needs/ wants, in other words a persons problem solving/ logic and other things too.

if you google the term with the words psychological definition you will find it means whats now called sense of agency here in the USA ( its now a DSM 5 diagnostics term) it means how much control an alter has when they are in physical control of the body, how they behave, the decisions that they make based on their goals (their jobs, purpose, reason for being created/ what their place is with in the system and much more)

example ....

Rainy's sense of agency (job, purpose reason for being created, what she did to take care of herself and what her position was in the system and more) was sadness / depression/ suicidal thoughts and behaviors, fear of thunder storms, get the body out of the storm and into clean/ dry clothing and self nurture with making a snack, wrap up in a blanket, sit and cry, watch tv....

when thelma was in control her sense of agency was intimacy, dating, her decisions, behaviors and everything she was, revolved around these goals and her position in the system.

in most internal systems there are some that have more control over things like this and some that have less control... each alter has their own sense of agency.

Rainy never went out on dates, had intimate relationships and thelma never ate a PB&J watching spunge bob while wrapped up in a blanket while crying because of the thunder storm.

my alters sense of agency were different from other members because other members didnt have my exact trauma's in the exact minute details that happened to me and the same with me my alters are going to be vastly different from yours or or anyone elses because I did not go through the exact life right down to minute details that you did. your systems executive controls (sense of agency) is what was needed for your system and survival and mine was what I needed when undergoing the childhood and trauma's that I did.

sometimes it is confusing when you are trying to do things by reading and such because theres more to having mental disorders then what you can read and try and apply and figure out, part of it is because definitions change day by day month by month year by year and with each supplemental or mass updating process.

my suggestion is talk with your treatment provider they can help you fond the right information and definitions that are presently being used and applies directly to you.