I should have done this years ago as I have never had a really great memory for the incidental. Such as remembering the date, or even the month, that my Daughter might be going off on holiday. I don't bother to remember because I know she will tell me again nearer the time. One of my Granddaughters might mention in passing that she has an A level exam in a month that to me is way too far in the future to bother remembering. One of them might say, "Shall we all go out for a meal at the end of the month" - Well, that is such a vague date that I don't bother to store that information away, as I know they will come back shortly and give me an absolute time and date.
Fed up, and also understanding my family's frustration with me, I decided that at all times I would carry a small notebook and write everything down that might seem of importance at a later date.
My notebook is a totally separate entity to my appointments diary. My diary is for keeping definite dates in as soon as I am informed of them, but my notebook is my brain's personal assistant.
One of my worst problems these last few years is what I tend to call "word slip". That means that I could be chatting away or merrily typing and a specific word will be totally unreachable. Try as hard as I can the word has gone. At some point, which could be a few minutes or a few hours, the word will suddenly pop into my head. I will then write that in my "brain" knowing that from then on that word will never slip me again.
If a neighbour says I'm thinking of going away in, lets say, June, will you look after my fish, I will write, "Fish in June".
Looking back on some of the pages of my notebook, even I haven't a clue now what half of the information is there for or what use it was at the time, but if it's ticked off then I have dealt with it and once again my real brain can forget it. But until it's been ticked off and because it's been written down, my real brain remembers it until it's unnecessary to continue doing so.
Sometimes is a single word. Sometimes it's a very short sentence. All probably necessary at the time, but life is far too short and my real brain only has so much capacity, that it's all not worth remembering forever.
To me now, my notebook is as important as my diary and my mobile.