As a computer guy, I don't feel qualified to do actual plumbing work, but I do feel that I have a reasonable mental model of how water flows into my apartment a

As a computer guy, I don't feel qualified to do actual plumbing work, but I do feel that I have a reasonable mental model of how water flows into my apartment and can imagine some reasons why it isn't. For example, I'd probably start troubleshooting by checking other taps in my plan and possibly asking neighbors if theirs work, to identify the extent of the issue. Then I guess I'll form three possible hypotheses: either there isn't water in our pipes, or there is water but it's blocked at some point, or there's water and it's leaking at some point. Then I'll try to eliminate the leak hypothesis, and assuming there isn't one, depending on the extent of the issue, I'll either call a plumber or the water utility number. Maybe as an engineer with a "systemizer" personality I'm naturally inclined to reason in this way, but I don't think it's too much to expect others to think about at least the basics of what their computer is doing.