We had a similar thread on this topic many years ago.
And in post number 7 there, I explained it like this:
Let’s start at the very,very beginning. ( sort of like explaining the birds and the bees, okay? When Mommy and Daddy love each other very much, they start to kiss…etc,etc.etc.)
There is an empty plot of land.
There are engineering drawings (called blueprints because 50 years ago the copying machines used blue paper).
There is a contractor.
There is somebody who wants to pay for it all.
The contractor brings in the very first workers.
They are the land surveyors… They have measuring instruments, and a bunch of wooden stakes and a hammer.They keep a copy of the blueprints in front of them, and they physically pound wooden stakes into the ground to show the bulldozer drivers where to dig, according to the measurements printed in the blueprints.
Then the contractor brings in the bulldozers.
The bulldozer drivers dig out the ground where the foundations will be. Then they go home and collect unemployment pay,(or hopefully move on to another job site.)
Then the surveyors return, and pound stakes into the ground with little nails in them, marking the precise location of each foundation. Then they go home to collect unemployment pay (or hopefully move on to another job site.)
The contractor brings in different workers (carpenters) to build the foundation forms. They stretch pieces of string between the little nails, so they can physically see where the foundations will be built. Then they build wooden forms exactly along the string lines, making boxes that will hold the wet concrete.They(or their foreman) keep a copy of the blueprint in front of them, so that they cut the wooden forms to size according to the measurements on the blueprint.
Then they go home to collect unemployment pay, (or hopefully move on to another job site.)
Then the contractor brings in different workers (steel workers) who put reinforcing steel rods into the wooden boxes. They(or their foreman) keep a copy of the blueprint in front of them, so that they can cut the steel rods to size and insert them according to the measurements on the blueprint
Then they go home to collect unemployment pay, or hopefully move on to another job site.
Then the contractor brings in different workers (concrete workers) who physically pour the concrete into the wooden boxes built by the carpenters and filled with steel by the ,well, steel workers. They don’t keep a copy of the blueprint in front of them, because the wooden boxes full of steel rods are in place, so it’s pretty obvious where to pour the concrete.
You get the picture? It looks really chaotic from afar…but it’s actually very well organized. Otherwise somebody loses a lot of money
It’s very simple…He does what his boss tells him to do.