Try this small exercise: create a functional description for a doorbell. What functions should it have to support the requirements that the users of the doorbell have? To make it a bit more difficult, make it the sort of doorbell for a group of flats that share a front door, with an intercom so you can speak with the person at the door, and the ability to open the door at a distance. Don't read any further: it shouldn't take long to do: what facilities does such a bell-intercom need to support? Now, while you're doing that, let me…
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