Software Methodologies

well, I have the drinks, can you just put the
beach chairs on the roof so we can sit?
sure, can you put the roof in place.
Sure, here it is.
Will it hold?
If I put columns underneath it will. here they are.
And what are they standing on?
Oh, ok, lets poor in the foundations.
Its getting dark, can you please turn on the light?
sure, I'll just go down to city hall to get the permit and install the wires.
Can you also put buildings together this way,
or just software?