3. Prerequisite Tree (PRT) construction algorithm
Let's start with a "very" difficult goal: to have water flowing from the tap whenever we want it. To us, this seems obvious, so let's place ourselves in a delicate context: a shantytown in an arid region.
3.1 Step 1
The aim is to list all the real obstacles to this flow:
salt, sand, etc., clog the pipes downstream of the valve;
we won't write "the clan chiefs are likely to put up guards to prevent access", but "to date, access to water has never been free";
wild spikes are organized, bringing the pressure down to 50% of nominal.
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Prerequisite Tree (PRT) construction algorithm
Algorithm for creating a Transition Tree (TRT)
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