deutschtoilet paper
The toilet paper heuristic:
Happened just to me: I have produced big work - well this one I did at the toilet. First, I felt eased.
But I did not look before, if there was enough paper left. Perhaps I was still sleeping, because I woke up recently.
When I grabbed the paper, I thought: “Will this be sufficient?”
You could now say: “Man, don’t you buy/store enough paper in the toilet?” Well, I did not buy any before, because I thought it would suffice until today. 
So, in that situation I hoped: “This must suffice.” And used then the paper wisely.
I was alone for the time being in the appartment. So, I could have also gotten a substitute from the kitchen. But you could imagine, how I would look like: pants down walking through the appartment. Since nobody was there at that time, also no problem 
Well, I could also use water to clean my a..
This incident let me rethink my visits in the toilet lately. I do not always use the paper wisely - I take too much often. If I think about it now: I can save even money with this (well, it may be not much money, but still…) and also help the environment.
So, the toilet paper awakes an analogy for me to the ressources in testing. We plan wisely our ressources for testing, but there are situations, where you have no toilet paper anymore.
So, either accept this fact always and hope that the ressources will suffice - but well this can have shitty outcome (I do not want to get in a situation where I have to use water).
If you are in such a situation, try then to find substitutes. There are always substitutes - you just have to imagine, how you can use xyz to fulfill your needs.
Or do not wait until it gets to that: start using the toilet paper wisely and plan in advance by observing.
Erkan Yilmaz
edit on 2007-03-31:
“One of life’s most overvalued pleasures is sexual intercourse; and, one of life`s least appreciated pleasures is defecation.” (Mark Twain)