Hi !
Basically with lists. A lot of them. Or by asking the other members of the team.
I sometimes work in a private health care clinic, into the cleaning or kitchen staff, I know the routine, but as we're there only during the summer holidays and sometime through the year, they don't care if we forget some things we're supposed to do, we can just ask. Kind of cool when another one is taking the lead and isn't sure about what to do.
We made a lot of mistakes (and we still do, because cleaning/kitchen work isn't quite stable, they tend to change the organization a lot, so we can't make lists) but it allowed us to learn what our difficulties are, and this was really helpful when they asked me to take care of the laundry for two weeks.
They gave me only two days with the woman who do the job usually to learn it and I would have nobody to ask my questions after that. So knowing what our issues are, I took a tone of notes, asked a loooot of questions about her organization for each day, then put everything clean and organized on my computer and printed it to keep it in my pocket. We also made and kept lists about uniforms we were supposed to prepare, etc (it saved our life a few times, because nurses have the tendencies to steal each other's uniform, and guess who's blamed after that ?...).
And I may have stolen some post-its from the kitchen to put them everywhere inside the laundry room to remember what chamber the clothes were from, whom uniform it was (because they don't have their owner's name on it, but numbers) etc.

People laughed when they saw what we did into the laundry room (literally post-its everywhere), but I didn't care, I did what I had to do to knowing what our difficulties are. We forgot almost nothing during those two weeks even if I wasn't the only one fronting from time to time, and the woman who asked us to do the job was impressed by our organization. Apparently, people tend to mess a lot when they start this job because they underestimate the difficulties.
If she only knew... this isn't far from what I do at home to not forgot everything we've planed to do through the day...
But people usually do a lot of mistakes during the first few weeks of their new job, it's normal. And being DID bring its own difficulties, so they don't have to always try to do as good as "normal" people. They have DID. They will be able to do their best only if they accept the fact they work differently than the others and are ready to learn from the mistakes they will make. Because they will make mistakes, and it will not be their fault. They are learning how to work together, it's not something easy to do. They are brave to try again !
I hope everything will be okay for them =)
.
French person with ADHD
Former partial DID
Functional multiplicty, highly integrated