deutschnever forget your keys
This heuristic I call: never forget your keys
BTW: I like the term “keys”, because it is similar to “key” (=main/important thing).
If I leave my appartment, I am always sure, that I can go back inside again.
I learned as child: always check - before closing the door - if you have your keys with you.
And with time, I do this now intuitively - just a short check in my pocket, until I hear sound or feel there is a bow (not what you think now 
).
The result is, that I always can go inside the appartment again (well, I could also by kicking in the door - but this would cause other problems).
Also other things come to mind, e.g.:
When I am with someone else and I hear key sound or we are standing at the door - I watch them and ask: “Do you have your keys?” So, this can help others too. But it could also be seen as redundant, because the other person already checked - this also has to be observed.
Or it could be said: “You are insecure/not self confident. You must do mechanical repetition.” Just a question: Do you know me well enough, to say so? How would you approach it? Don’t you condition/train yourself like this?
What does this mean?
If you want to learn something, start it by training yourself. Take really the time to do it. If you invest now, you will profit in the future from this. It all begins with the first step and repetition to stay on track.
In this case I want to learn to use heuristics more efficient.
So, reading about it is fine, but writing about it will help me more. Probably this will cost me more time. But I think I will profit from this a lot (when seeing it under cost and value).
So, as Confucius said 450 BC: “Tell Me and I Will Forget; Show Me and I May Remember; Involve Me and I Will Understand.”
Now I try to involve myself more with heuristics and blog about it.
Erkan Yilmaz